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Aida, Gilang Rusrita, Rhochmad Wahyu Illahi, and Tyas Dita Pramesthy. "Analisys of The Effect of Fisherman, Fishing Boat, and Fishery Ports on Catching Fisheries Production in East Java Province." Barakuda 45: Jurnal Ilmu Perikanan dan Kelautan 5, no. 1 (April 30, 2023): 35–44. http://dx.doi.org/10.47685/barakuda45.v5i1.338.
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The importance of the fisheries sector for East Java Province can be seen from the high capture fisheries production compared to other provinces di Indonesia. In 2021, East Java Province is listed as the province with the highest capture fisheries production in Indonesia. This is suspected to be affected by several factors i.e the numberi of fishermen, fishing vessels, and fishing ports, so analysis is needed to determinei the effect of these factors on capture fisheries in East Java. The aim of this studyi was to determine the effect of the amount of fishermen, fishing boats, and fishing ports on capture fisheries production in East Java. The research methodi used in this research iis descriptive using secondary data. The data analysis used is multiplei linear regression, F-test, and T-test. Based on the results, the multiple linear regression analysis were obtained by the equation y = 292.543,118 + 0,381 X1-0,722 X2 + 2.838,450 X3 with an adjusted R2 value of 72,7 %. The F test shows a isignificance <0,05, which meansi that the total number of fishermen, fishing boats, and fishing ports have a significant effecti simultaneously on capture fisheries production in East Java. The T-test shows that the numberi of fishing ports has a partially significant effect on marine capture fisheries production in East Java Province (sig. <0,05). Meanwhile, the number ofi fishermen and fishingi boats showed no partially significant effect oni capture fisheriesi production in East Java Province (sig. > 0,05).
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PAN, QIUHUI, MENGPING LI, MINGFENG HE, and XIAOJIA MU. "THE EFFECT OF "CLOSED FISHING" IN CHINA." International Journal of Modern Physics C 18, no. 03 (March 2007): 391–98. http://dx.doi.org/10.1142/s0129183107010504.
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A fishing model is presented in this paper. A year is divided into four seasons on the basis of the Penna model. We define the rules of death, reproduction, fishing and so on for fish. And "closed fishing" in China is introduced in this model. Then we discuss the population size of fish and the fishing products in the case of "closed fishing" or not. At last the conclusion is obtained that the policy will be significant if fishing intensity is in a certain range. And reducing fishing intensity is essential policy, and "closed fishing" is just an accessorial policy.
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Zhou, Yanheng, and Zhineng Hu. "The Preventive Effect of Outdoor Recreational Fishing on Anxiety Disorder." E3S Web of Conferences 409 (2023): 06001. http://dx.doi.org/10.1051/e3sconf/202340906001.
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Background: Anxiety disorder, a severe global public health problem, has caused many adverse effects. Effectively preventing anxiety disorder is very important. This paper chose recreational fishing as an intervention measure to explore its effect on preventing anxiety disorder. Methods: The prevention effect of recreational fishing on anxiety disorder and the heterogeneity of this effect were analyzed through the ordinal logistic regression model. The robustness of the main results was tested through the multiple linear regression models. Results: “Fishing” significantly affected the anxiety level of residents. Compared with those who did not participate in outdoor recreational fishing, for those who participated there is a 3.494 decrease in the log odds of being in a higher severity of the anxiety level. With the increase in age, the negative effect of recreational fishing on anxiety levels was significantly lower. Conclusion: We focused on the preventive effect of outdoor recreational fishing on anxiety, contributing to add some evidence for non-medical measures to prevent anxiety disorder. Participation in outdoor recreational fishing has a significant prevention effect on anxiety disorder. Older people have less effect in preventing anxiety disorder by participating in fishing.
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Thorlindsson, Thorolfur. "The Skipper Effect in the Icelandic Herring Fishery." Human Organization 47, no. 3 (September 1, 1988): 199–212. http://dx.doi.org/10.17730/humo.47.3.1584t42x24702552.
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The centrality of the skipper to the economic and social organization of fishing is based on the assumption that he plays an important role in fishing success. This crucial assumption has recently been hotly debated in the social science literature in various contexts. In this study an attempt is made to estimate the role of the skipper in fishing success. The study is based on data from the Icelandic summer herring fishery from the years 1959, 1960 and 1961. The analysis of the data shows a correlation ranging from .59 to .70 for the skippers' catches between fishing seasons. When relevant variables—size of boat and time spent fishing—are controlled for, correlation for skippers' catches between seasons remains high (Beta = .52 and .53). Further, analysis of case histories of individual skippers and other qualitative evidence support the view that the skipper plays a central role in fishing success. Finally, results are discussed in the context of current social science debate around the folk belief in the skipper effect.
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Ralston, Stephen, and Michael R. O’Farrell. "Spatial variation in fishing intensity and its effect on yield." Canadian Journal of Fisheries and Aquatic Sciences 65, no. 4 (April 1, 2008): 588–99. http://dx.doi.org/10.1139/f07-174.
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Fishing mortality is rarely, if ever, evenly distributed over space, yet this is a common assumption of many fisheries models. To evaluate the effect of spatial heterogeneity in fishing mortality on yield, we constructed age-structured models that allowed for differing levels of fishing in three regions within the boundaries of a stock and explored alternative assumptions about the life stage in which density-dependent compensation operates. If the fishing mortality rate (F) is not excessive (i.e., F ≤ FMSY defined for the spatially homogeneous case; MSY, maximum sustainable yield), simulations demonstrated that minor to moderate spatial variation in fishing intensity does not impact sustainable yield. However, if fishing mortality is excessive (F > FMSY), spatial variation in fishing intensity often improves yield and can actually produce yields in excess of MSY when compensation occurs after dispersal, and the density-dependent recruitment rate is a function of the local density of adults. The yield premium generated in these simulations by postdispersal density dependence is due to a low level of compensatory mortality in heavily fished areas coupled with dispersal of propagules into these areas from lightly fished adjacent regions.
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Soeprijadi, Liliek, Endang Yuli, Edi Susilo, and Rudianto Rudianto. "Model Joint Business Group Based Knowledge for Fishermen Community Empowerment Strategies (Case Study of Business Diversification on Solid Capture Region Cirebon City)." Business and Management Horizons 1, no. 1 (April 5, 2013): 96. http://dx.doi.org/10.5296/bmh.v1i1.3485.
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The purpose of this study was to analyze the effect of public capital fishing, fish processing business and micro-business skills to the programs and activities of the agency joint venture (KUB) coastal fishing town of Cirebon: to analyze the effect of public capital fishing, fish processing business and micro-enterprise skills through the agency the joint venture (KUB) fisherman exchange coastal fishing town of Cirebon: to analyze the effect of public capital fishing, fish processing business and micro-enterprise skills through a joint venture group institutions (KUB) and exchange fishing to conservation of fish resources in the coastal city of Cirebon , and to formulate a model of the joint venture (KUB) knowledge as a strategy of empowerment of fishing communities in the city of Cirebon. Analysis of regression weights measurement models with business groups (KUB) based knowledge as a fishing community empowerment strategy was as follows: capital fishing communities and micro-enterprise skills significantly influence the institutional joint venture (KUB) Cirebon fishermen. While the fish processing business variables didn’t significantly influence the institutional joint venture (KUB) Cirebon fishermen; stock fishing communities, fish processing business and micro-enterprise skills together through the institution of the joint venture (KUB) fisherman significant effect on the value of rate of coastal fishing town of Cirebon. While the partial correlation between public capital fishing, fish processing business and micro-enterprise skills exchange coastal fishing town of Cirebon was not significant; stock fishing communities, fish processing business and micro-enterprise skills together through the institution of the joint venture (KUB) and exchange rates have a significant effect fishing conservation of coastal fish resources Cirebon. While the partial correlation between public capital fishing, fish processing business and micro-business skills for the preservation of coastal fishery resources Cirebon was not significant, and KUB institutional model based knowledge capital in the form of fishing communities, fish processing business and micro-enterprise skills through a strategy of empowerment fishing communities significantly influence conservation of fish resources in coastal city of Cirebon.
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Cheon, Deok Hee, and Young Kwan Lee. "Effects of Fishing Village Tourism Motivation on Destination Image, Traveler Satisfaction and Loyalty." Convergence Tourism Contents Society 9, no. 2 (August 31, 2023): 191–204. http://dx.doi.org/10.22556/jctc.2023.9.2.191.
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Purpose Fishing village tourism is a form of tourism that has been newly started according to the economic revitalization of underdeveloped fishing villages, the increase in leisure time and income of tourists, and the diversification of tourism needs. In order to maintain sustainable fishing village tourism, it is necessary to identify what motives tourists participate in fishing village tourism and to empirically study the effects of these motivation factors on destination image and tourist satisfaction and loyalty.
Methods A survey was conducted on tourists who visited Daeyado, Yongshin, and Gagyeongju fishing villages located in Taean, which are representative tourist destinations in the west coast, and 176 questionnaires were used for empirical analysis.
Results As a result of factor analysis, motivation for fishing village tourism was classified into five factors: nature appreciation, eating and purchasing marine products, family relations and rest, fishing village experience, and marine leisure sports experience, and destination image and traveler satisfaction and loyalty were each classified as a single dimension. As a result of the hypothesis verification, among the motives for fishing village tourism, factors such as family relations and rest, eating and purchasing marine products, nature appreciation, and marine leisure sports experience had a significant effect on the destination image, and fishing village experience, nature appreciation, and marine leisure sports experience factors had a significant effect on traveler satisfaction. It was verified that the destination image had a significant effect on traveler satisfaction and loyalty, and traveler satisfaction had a significant effect on loyalty.
Conclusion In the end, it was studied that a good destination image can be planted according to the motive of fishing village tourism, and the loyalty of revisit, word of mouth, and recommendation can be increased by increasing the satisfaction of travelers.
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Marchal, Paul, Bo Andersen, David Bromley, Ane Iriondo, Stéphanie Mahévas, Floor Quirijns, Brian Rackham, Marina Santurtún, Nicola Tien, and Clara Ulrich. "Improving the definition of fishing effort for important European fleets by accounting for the skipper effect." Canadian Journal of Fisheries and Aquatic Sciences 63, no. 3 (March 1, 2006): 510–33. http://dx.doi.org/10.1139/f05-238.
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The scope of this paper is to quantify, for a wide selection of European fisheries, fishing tactics and strategies and to evaluate the benefits of adjusting the definition of fishing effort using these elements. Fishing tactics and strategies were identified by métiers choices and a series of indices. These indices have been derived to reflect shifts in tactics (within a fishing trip) and in strategies (within a year). The ShannonWiener spatial diversity indices of fishing tactics (FT_SW) and strategies (YE_SW) had the greatest impact on catch rates. In particular, FT_SW was always negatively correlated to catch rates. One may anticipate that during a fishing trip, vessels with high FT_SW have been searching fish aggregations for a long time, while vessels with low FT_SW have been more efficient in finding these aggregations. The linkage between YE_SW and catch rates was of a more complex nature. Adjusting fishing effort by means of (i) the métier effect and (ii) the indices of tactics and strategies generally led to a substantial gain in the precision of the relationship between fishing mortality and fishing effort.
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Lee, Sangheon, Yukio Akiba, Tateki Kurosu, and Masamori Iida. "Effect of Ag2O on fishing effect of bipbsrcacuo superconductor." Electronics and Communications in Japan (Part II: Electronics) 76, no. 8 (1993): 99–109. http://dx.doi.org/10.1002/ecjb.4420760810.
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Rochet, Marie-Joëlle, and Verena M. Trenkel. "Which community indicators can measure the impact of fishing? A review and proposals." Canadian Journal of Fisheries and Aquatic Sciences 60, no. 1 (January 1, 2003): 86–99. http://dx.doi.org/10.1139/f02-164.
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Population and community descriptors that might be used as indicators of the impact of fishing are reviewed. The criteria used for the evaluation of these indicators are meaning, expected effect of fishing, exclusiveness to fishing effects, and measurability. Population indicators such as total mortality rate, exploitation rate, or average length are the most operational indicators because their meaning is clear and the expected effect of fishing on them is well understood so that reference points can be set. On the other hand, indicators based on the composition of species assemblages such as diversity indices and ordination of species abundances are difficult to interpret, and the effect of fishing on them is not easily predicted. Robust indicators describing the community functions of interest (production and transfer of biomass to large fish), such as size spectra descriptors or the proportion of piscivorous fish in the community, are more promising but are not yet well developed. New candidate indicators are proposed: the change in fishing mortality required to reverse population growth rate, the proportion of noncommercial species in the community, and the average length and weight in the community.
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Metzner, Rebecca. "Fishing Aspirations and Fishing Capacity: Two Key Management Issues." International Journal of Marine and Coastal Law 20, no. 3 (2005): 459–78. http://dx.doi.org/10.1163/157180805775098603.
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AbstractThis article explores a variety of topics related to fishing aspirations and capacity management—two key components of effective management of high seas fisheries. Because of the profound influence of capacity management and capacity reduction measures on the way participants give effect to their aspirations and conduct their fishing operations, the article details the critical linkages between established capacity management options and their respective abilities to address capacity concerns, affect fishing behaviour, and accommodate fishing aspirations. The article begins with a discussion of fishing aspirations, examines established capacity management measures, and considers some of the challenges and opportunities for addressing fishing aspirations and capacity management in high seas fisheries.
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Amin, Sajjad, Chuang Li, Yousaf Ali Khan, and Amina Bibi. "Fishing grounds footprint and economic freedom indexes: Evidence from Asia-Pacific." PLOS ONE 17, no. 4 (April 13, 2022): e0263872. http://dx.doi.org/10.1371/journal.pone.0263872.
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Environmental challenges are as wide as the universe so that its different dimensions can be the subject of diverse studies. In this research, using 17 data from Asia-Pacific during the period 2000 to 2017, an attempt has been made to investigate the economic factors responsible for the ecological footprint in the fishing sector. The main contribution of the present study is to investigate the effects of nine economic freedom indicators along with other control variables on environmental pressure on the status of fishery resources. Based on the results, the Kuznets curve hypothesis was confirmed in the fishing grounds footprint, so that the growth of GDP per capita shows a positive and significant effect, while its squared form coefficient is negative. Other control variables including natural resource rents, urbanization, and energy intensity, do not show significant effects on the fishing footprint. The different components of economic freedom show different effects, while their cumulative effects in the form of the total economic freedom index have a positive effect on the footprint of fishing and lead to increased extraction from fishing resources. The results show that the Government Integrity, Tax Burden, Business Freedom, Monetary Freedom indices increase the fishing footprint, while the indices of trade freedom and investment freedom, by revealing the negative effects on the fishing footprint, have beneficial environmental effects in reducing the pressure on the aquatic resources of countries. The results of the present study reveal the need to examine how the various dimensions of economic freedom affect to provide the proper management of fishery resources.
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Labropoulou, M., C. D. Maravelias, and C. Papaconstantinou. "Factors affecting commercial trawl fleet landings in a multispecies fishery." Journal of the Marine Biological Association of the United Kingdom 83, no. 1 (January 10, 2003): 205–15. http://dx.doi.org/10.1017/s0025315403006982h.
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Retained catches of trawl fleet in Chalkis fishing port-market, Greece, were analysed using generalized linear models (GLMs) in an attempt to identify factors that influence the total landings of the groundfish fisheries. Main effects in the model included a factor for vessel tonnage that determined fishing power, as well as factors for month and fishing area. Covariates examined were all found to have a significant effect on the retained catches, with month and vessel capacity alone explaining 38% and 30% respectively of the total variation of the data. Significant interactions observed indicate that the fluctuations in retained catch differed by fishing area and month as well as by fishing area and vessel category. Within vessel categories, month and fishing area also had significant effects on the retained catches, with fishing area being more important than month for the smallest vessels. Results indicate that the modelling approach of retained catches from trawl fisheries is a promising method for obtaining representative abundance indices.
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Ahnesjö, Jonas, and Tom Danielsson. "Organized recreational fishing in school, knowledge about nature and influence on outdoor recreation habits." Journal of Outdoor and Environmental Education 23, no. 3 (August 1, 2020): 261–73. http://dx.doi.org/10.1007/s42322-020-00061-8.
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Abstract In this study we have investigated the effectiveness of a one day school-based intervention with recreational fishing (in Swedish called Klassdraget) in increasing environmental awareness, interest in nature and recreational fishing in pupils aged between 8 and 12. Our results suggest a weak positive association between exposure to natural environments in a recreational fishing context and interest in nature and recreational fishing. We found the intervention to have no effect on the frequency of fishing, interest in fishing more, or number of visits in nature during spare time. Knowledge about nature and possibly also environmental awareness are positively affected and these effects can be traced as long as three years after the intervention. Our findings also reveal a low correlation between frequency of nature visits and self-reported interest in nature. The observed effects of Klassdraget are small but appear to be larger for girls, who are traditionally less interested in recreational fishing when compared with boys.
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Gaichas, Sarah K., Garrett Odell, Kerim Y. Aydin, and Robert C. Francis. "Beyond the defaults: functional response parameter space and ecosystem-level fishing thresholds in dynamic food web model simulations." Canadian Journal of Fisheries and Aquatic Sciences 69, no. 12 (December 2012): 2077–94. http://dx.doi.org/10.1139/f2012-099.
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Dynamic food web models are increasingly used to investigate the ecosystem effects of fishing; however, key unknown functional response parameters describing predator-prey interactions strongly influence model behavior. We explored functional response parameter uncertainty and its effect on fishing simulation results using a dynamic food web model of the Gulf of Alaska (GOA) with14 fishing fleets, 104 consumer groups, four primary producer groups, and five detritus pools. After generating millions of potential ecosystems with randomly selected functional response parameters, we assigned groups of these randomly parameterized systems to one of five increasingly intense ecosystem-wide fishing treatments. For each fishing treatment, we counted and compared resulting ecosystems with no extinctions. Surprisingly, the model GOA ecosystems were robust to a wide range of functional response parameters. However, we found an abrupt threshold effect between moderate and heavy exploitation rates, beyond which a much lower proportion of model ecosystems persisted. Beyond this fishing threshold, extinction was more likely, and system attributes differed greatly from moderately fished model ecosystems. Fishing thresholds were not found with default functional response parameters, implying that model simulations should include a wide range of parameterizations to reflect ecological uncertainty and to support sustainable ecosystem-based fishery management.
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Pfeiffer, Lisa, and Trevor Gratz. "The effect of rights-based fisheries management on risk taking and fishing safety." Proceedings of the National Academy of Sciences 113, no. 10 (February 16, 2016): 2615–20. http://dx.doi.org/10.1073/pnas.1509456113.
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Commercial fishing is a dangerous occupation despite decades of regulatory initiatives aimed at making it safer. We posit that rights-based fisheries management (the individual allocation of fishing quota to vessels or fishing entities, also called catch shares) can improve safety by solving many of the problems associated with the competitive race to fish experienced in fisheries around the world. The competitive nature of such fisheries results in risky behavior such as fishing in poor weather, overloading vessels with fishing gear, and neglecting maintenance. Although not necessarily intended to address safety issues, catch shares eliminate many of the economic incentives to fish as rapidly as possible. We develop a dataset and methods to empirically evaluate the effects of the adoption of catch shares management on a particularly risky type of behavior: the propensity to fish in stormy weather. After catch shares was implemented in an economically important US West Coast fishery, a fisherman’s probability of taking a fishing trip in high wind conditions decreased by 82% compared with only 31% in the former race to fish fishery. Overall, catch shares caused the average annual rate of fishing on high wind days to decrease by 79%. These results are evidence that institutional changes can significantly reduce individual, voluntary risk exposure and result in safer fisheries.
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Gulland, J. A. "The effect of fishing on community structure." South African Journal of Marine Science 5, no. 1 (June 1, 1987): 839–49. http://dx.doi.org/10.2989/025776187784522225.
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Golam Rabbani, Md, Md Akhtaruzzaman Khan, M. Serajul Islam, and Rozina Yeasmin Lucky. "Technical Efficiency of the Setbag Net Fishery in Bangladesh: An Application of a Stochastic Production Frontier Model." Agriculturists 15, no. 2 (January 26, 2018): 59–65. http://dx.doi.org/10.3329/agric.v15i2.35465.
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A study was conducted to examine the technical efficiency for Setbag net fishing boats operated in the year 2014. A total of 100 samples of Setbag net fishing boats were selected, of which 40 were from Cox’s Bazar, 40 were from Chittagong and 20 were from Bagerhat. Stochastic frontier (with technical inefficiency effect) model was specified and estimated. Results have shown that the estimated mean technical efficiency of Setbag net fishing boats is 84 percent. The efficiency of Setbag net fishing boat was positively associated with total cost, while the number of nets were negatively related to fishing day and crew size. Head maji’s age had significant effect on inefficiency at 5% level. Although, the effect on boats’ efficiency was positive, (though insignificant) for head maji’s experience, head maji’s education, engine horse power and boat age. The use of modern fishing boat and improved fishing technology should be promoted, through proper training and motivation program for fisher. At the same time old and unfit fishing boat and gears should be gradually removed and replaced by new and modern fishing boat.The Agriculturists 2017; 15(2) 59-65
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Alekhnovich, A. V. "Populations of long-clawed crayfish Pontastacus leptodactylus: Effect of commercial fishing on the size and age structure." Vestnik MGTU 26, no. 2 (June 30, 2023): 93–98. http://dx.doi.org/10.21443/1560-9278-2023-26-2-93-98.
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Fishing affects the population of crayfish, while it changes the size and age characteristics. The size and age parameters of two populations of the narrow-clawed crayfish Pontastacus leptodactylus in the Loktyshi (Brest Region) and Krasnoslobodskoe (Minsk Region) reservoirs in Belarus have been compared. The Krasnoslobodskoye reservoir is intensively exploited with an annual catch of 3–4 tons of crayfish. There is no commercial fishing in the Loktyshi reservoir. Studies show that the average size of individuals in an intensively exploited population is smaller in comparison with a population where there is no commercial fishing for crayfish. Since crayfish fishing is regulated by a commercial measure (10.5 cm of total length) in intensively exploited populations, the average sizes of individuals are close to these limiting values. The life expectancy of crayfish is somewhat higher in the Loktyshi reservoir, where only amateur crayfish fishing is noted. Intensive fishing increases the mortality of females, whose annual survival rate is 37 %, while in the absence of fishing, the survival of females increases up to 57 %. The annual survival rate of males is 41–49 %. The fishing pressure leads to decrease in the survival rate of individuals and disappearance of crayfish aged 9–10 years from the population.
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Aspen, R. J., S. Vardy, R. G. Perkins, I. R. Davidson, R. Bates, and D. M. Paterson. "The effects of clam fishing on the properties of surface sediments in the lagoon of Venice, Italy." Hydrology and Earth System Sciences 8, no. 2 (April 30, 2004): 160–69. http://dx.doi.org/10.5194/hess-8-160-2004.
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Abstract. Harvesting of clams(Tapes philippinarum) has important socio-economic and environmental implications for the Venice lagoon area, Italy. Clam harvesting disrupts the structure of benthic communities but the effects upon sediment stability and surface structure remain unclear. The effect of clam fishing on the sediment properties of the lagoon bed was investigated at two different sites, a heavily fished site (San Angelo) and an infrequently fished site (San Giaccomo). Both sites were assessed for immediate impacts of fishing, using indicators of biogenic sediment stabilisation. Samples were taken at three points along three 100 m linear transects at each site prior to and post fishing. Paired samples were also taken parallel to each transect at a distance of 5m, to allow for temporal variation. Sediment stability, measured with a cohesive strength meter (CSM), was significantly higher at the less impacted site (F1,34 = 6.23, p < 0.018), was correlated with indicators of biogenic sediment stabilisation and decreased by approximately 50% following the trawling event. Concomitant decreases in chlorophyll a (chl a), colloidal-S carbohydrate and dry bulk density were observed on the transect after fishing but not adjacent to the fishing path. At the heavily impacted site, clam fishing by trawling had, in general, no significant effect on the biological and physical properties (although chl a did decrease significantly after fishing). The lack of a significant impact from fishing at the impacted site was attributed to the higher frequency of fishing occurring in this area. Hence, frequent fishing of the lagoon prevents establishment of biotic communities, preventing biostabilisation and thus reduces the stability of the surface sediment. Keywords: clam harvesting, erosion threshold, microphytobenthos, sediment, stability
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Storero, Lorena P., Maite A. Narvarte, and Raúl A. González. "Marine Protected Areas: reserve effect or natural variability? The Patagonian octopus case." Journal of the Marine Biological Association of the United Kingdom 93, no. 1 (May 11, 2012): 259–66. http://dx.doi.org/10.1017/s0025315412000525.
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Population characteristics can be influenced by specific factors of the habitat and the natural variability of populations can confuse the effect related to protected environments. This study compares the demographic characteristics of Octopus tehuelchus in three coastal environments: two Marine Protected Areas (San Antonio Bay (SAB) and Islote Lobos (IL)) and a traditional fishing zone (El Fuerte (EF)). Weight–frequency distributions, sex-ratio and recruitment were monthly compared between the three intertidal zones. Octopus tehuelchus was smaller in IL, where fishing intensity is lower or null, and reached the largest sizes in the main fishing area of EF and within SAB (where there is no regulation and a mid–high fishing intensity). The sex proportion in SAB and EF was 1:1 all along the year. Although the proportion of mature females in IL was higher, the highest recruitment was observed in EF (the traditional fishing ground). These new data suggest that previous studies, which reported that Marine Protected Areas have positive effects for O. tehuelchus populations, can no longer be supported, and highlight the importance of understanding and quantifying the magnitude and range of natural variability in each environment when assessing the effectiveness of Marine Protected Areas.
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Prayogi, Putu Agus, and Ni Komang Julyanti Paramita Sari. "The Influence of Personal Selling and Promotion Through Social Media on Tourists' Decisions in Buying Fishing Tour Packages in the Coastal Areas of Bali." Jurnal Manajemen Pelayanan Hotel 7, no. 1 (June 30, 2023): 300. http://dx.doi.org/10.37484/jmph.070115.
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The purpose of this study was to analyze the effect of promotion on social media and personal selling on guests' decisions in buying fishing tour packages in the coastal areas of Bali. This study used the purposive sampling method to analyze it, samples from guests who had used fishing tour packages in the coastal areas of Bali. Data was taken from 60 customers. It is analyzed with Regression Analysis Technic, it has been validated, reliability, and classical assumptions. Research shows that 1) Promotion on social media has a positive and significant effect on purchasing fishing tour packages in Bali's coastal areas; 2) Personal selling has a positive and significant effect on the decision to buy fishing tour packages in the coastal areas of Bali;3) Promotions on social media and personal selling have a positive and significant effect on the decision to buy fishing tour packages in the coastal areas of Bali; 4) The variable effect of promoting through social and personal media becomes the guest's decision to purchase a fishing package in the coastal area; and 5) The personal selling variable is more dominant in influencing the purchasing decision of fishing tour packages in the coastal areas of Bali. The implication of this study is the management of Bali's coastal areas to increase promotion through social media and personal selling to get customer intentions and they make the decision to buy fishing tour packages in the coastal areas of Bali Keywords: Promotion trough social media, Personal selling, Buying decision.
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Shen, Haixue, Martin W. Dorn, Vidar Wespestad, and Terrance J. Quinn. "Schooling pattern of eastern Bering Sea walleye pollock and its effect on fishing behaviour." ICES Journal of Marine Science 66, no. 6 (March 31, 2009): 1284–88. http://dx.doi.org/10.1093/icesjms/fsp071.
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Abstract Shen, H., Dorn, M. W., Wespestad, V., and Quinn, T. J. 2009. Schooling pattern of eastern Bering Sea walleye pollock and its effect on fishing behaviour. – ICES Journal of Marine Science, 66: 1284–1288 Walleye pollock (Theragra chalcogramma) form persistent midwater and near-bottom schools in the daytime during the winter spawning season in the eastern Bering Sea (EBS). Two spawning areas in the EBS, north of Unimak Island and near the Pribilof Islands, are the main fishing grounds. To study the schooling pattern of pollock and its effect on fishing behaviour on these two fishing grounds, a principal component analysis with instrumental variables was carried out using acoustic and observer data from 2003 and 2005. Significant differences between the school descriptors distinguished the schooling patterns among areas and years. The harvester, that is to say, the fishing vessel and its crew taken together, searched for fish aggregations, which were caught in a different manner when the schooling pattern changed. School density had a greater effect than school size on fishing behaviour. Aggregations were less dense in 2003 than in 2005, and the harvester tended to fish with longer tows, at higher speeds, when it encountered less dense aggregations.
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Dunlop, Erin S., Daisuke Goto, and Donald A. Jackson. "Fishing down then up the food web of an invaded lake." Proceedings of the National Academy of Sciences 116, no. 40 (September 16, 2019): 19995–20001. http://dx.doi.org/10.1073/pnas.1908272116.
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Analysis of commercial catches reveals a serial depletion of some oceanic fish stocks over time, resulting in fisheries focusing on increasingly smaller species closer to the base of the food chain. This effect, described as fishing down the marine food web, is observed when the trophic level of the catch declines over time, raising concerns about the ecosystem impacts of fishing. Freshwater systems also experience harvest, yet do not appear to commonly show the same fishing down response perhaps because time series are too short to witness early depletions, fishing is often recreational, or other factors like stocking and invasive species influence patterns. Here we make use of extensive catch records from Lake Simcoe dating back to the 1860s, to examine if fishing down effects are observed in this highly exploited Canadian inland lake. We measured 2 commonly used indicators from catch data, mean trophic level (MTL) and fishing-in-balance (FiB), and compared trends between a historical period dominated by commercial fishing and a contemporary period when commercial fishing ceased and recreational fishing effort increased. We found a striking difference between the 2 time periods, with MTL (and to some extent FiB) declining during commercial fishing but increasing during recreational fishing. However, indicators either increased or decreased due to invasive species and increased due to stocking. We show that while declining MTL can occur in a freshwater lake, the trajectory can be altered by a switch to recreational fishing, as well as stocking and invasive species.
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Marçalo, A., J. Araújo, P. PousãoFerreira, K. Erzini, and Y. Stratoudakis. "Effect of simulated purse seine fishing on acclimated sardines and post-fishing interactions with predators." Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology 150, no. 3 (July 2008): S95—S96. http://dx.doi.org/10.1016/j.cbpa.2008.04.187.
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Tua, Amry Mangihut. "THE DROWNING POLICY THE FOREIGN FISHING VESSELS OF ILLEGAL FISHINGBY INDONESIA GOVERNMENT IN INTERNATIONAL LAW PERSPECTIVE." Legal Standing : Jurnal Ilmu Hukum 3, no. 2 (October 19, 2019): 32. http://dx.doi.org/10.24269/ls.v3i2.1918.
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The drowning of foreign fishing vessels of illegal fishing actors in Indonesia teritory is one of law enforcement efforts to against the eradication of illegal fishing and to enforce the sovereignty of the territory of the Republic of Indonesia. It is a special act mandated in Article 69 paragraph (4) of Law No. 45 of 2009 on fisheries. This sinking policy invites controversy from neighboring countries because it is considered as an action that violates the principle of peaceful dispute resolution and is not regulated in international law. Indonesia keep continues to enforce this policy because it is considered the most effective step in reducing massive illegal fishing in Indonesian waters and has a deterrent effect for the actors. Keywords: drowning policy of foreign ship, illegal fishing, international law
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Pfeiffer, Lisa, and Alan C. Haynie. "The effect of decreasing seasonal sea-ice cover on the winter Bering Sea pollock fishery." ICES Journal of Marine Science 69, no. 7 (June 8, 2012): 1148–59. http://dx.doi.org/10.1093/icesjms/fss097.
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Abstract Pfeiffer, L., and Haynie, A. C. 2012. The effect of decreasing seasonal sea-ice cover on the winter Bering Sea pollock fishery. – ICES Journal of Marine Science, 69: . The winter fishing season for eastern Bering Sea pollock (Theragra chalcogramma) is during the period of maximum seasonal sea-ice extent, but harvesters avoid fishing in ice-covered waters. Global climate models predict a 40% reduction in winter ice cover by 2050, with potential implications for the costs incurred by vessels travelling to and around their fishing grounds and the value of their catch. Additionally, it may open entirely new areas to fishing. Using retrospective data from 1999 to 2009, a period of extensive annual climate variation, the variation in important characteristics of the fishery is analysed. When ice is present, it restricts a portion of the fishing grounds, but in general, ice-restricted areas have lower expected profits at the time of restriction than the areas left open. Some areas show a change in effort in warm years relative to cold, but the global redistribution of effort attributable to ice cover is small. This is largely because the winter fishery is driven by the pursuit of roe-bearing fish whose spawning location is stable in the southern part of the fishing grounds.
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Yulinda, E., K. Supian, and M. Saad. "The Effect of Trust on the Fishing Industry Supply Chain Performance in Rokan Hilir Regency Riau Province, Indonesia." IOP Conference Series: Earth and Environmental Science 934, no. 1 (November 1, 2021): 012044. http://dx.doi.org/10.1088/1755-1315/934/1/012044.
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Abstract This research was conducted in August-October 2020 in Rokan Hilir Regency, the largest central of the fishing industry in Riau Province, Indonesia. The research objective to analyse the effect of trust on the fishing industry supply chain performance in the regency. Respondents were set 270 fishing companies based on the Slovin formula. They were taken purposively in four fishing centres, namely Panipahan (Pasir Limau Kapas district), Bagansiapiapi (Bangko), Kubu Babussalam, and Sinaboi. Collecting data using a closed questionnaire, containing a number of statements measured by a 7-point Likert scale. The data collected includes trust (credibility, top management capability, and government support), and supply chain performance (smooth of goods flow, financial flow, and information flow). Data analysed using the Structural Equation Modeling-Partial Least Square (SEM-PLS) method with the help of SmartPLS 3.3 software. The results showed that the trust has a positive and significant effect on the fishing industry performance in Rokan Hilir. This happens because the relationship between fellow entities of fishing industry supply chain occurs based on trust. The relationship between fishing companies (fisherman) and tauke (fish collectors, agents, and exporters) is based on patron-client ties, while the relationship between fellow tauke is based on family/blood ties. Both types of relationships have existed for years.
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van Hoof, Luc. "Design or pragmatic evolution: applying ITQs in EU fisheries management." ICES Journal of Marine Science 70, no. 2 (January 17, 2013): 462–70. http://dx.doi.org/10.1093/icesjms/fss189.
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Abstract Van Hoof, L. 2013. Design or pragmatic evolution: applying ITQs in EU fisheries management. – ICES Journal of Marine Science, 70: 462–470. Among the proposals for the 2012 revision of the EU Common Fisheries Policy, a strong case is made for the introduction of a system of rights-based management. The EU perceives individual fishing concessions as an important instrument for capacity management. We will use the introduction of individual tradable quotas in the management of the Dutch North Sea beam trawl fisheries as a case for exploring the effect of the introduction of such an instrument. The effect will be assessed in terms of reduction of fishing capacity in the Dutch beam trawl fleet and its economic and social impact. These Dutch experiences will be translated to the current debate on the reform of the EU Common Fisheries Policy. Especially, we will focus on the issues of "relative stability", the concentration of rights, and the effects on the small-scale fisheries sector. Some of the negative effects associated with individual tradable rights can be addressed through design. However, trying to maintain stability and counter perceived negative impacts on fishing communities will modify the effect of introducing individual fishing concessions.
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Neves, João Bernardo, Filipe Martinho, and Miguel Ângelo Pardal. "Effect of illegal glass eel (Anguilla anguilla) fishery on estuarine fish stocks: a case study in the Mondego Estuary, Portugal." Marine and Freshwater Research 69, no. 11 (2018): 1692. http://dx.doi.org/10.1071/mf17364.
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Illegal fishing is a critical activity that affects a wide range of species, leading to a decline in total abundance and the overexploitation of target and non-target species. In Portugal, despite fishing for eel juveniles not being allowed, a substantial amount of illegal fishing takes place during the migratory season (October–March). The aim of this study was to investigate the effects of glass eel fishing in the Mondego estuary on target and non-target species. Samples were collected between November 2011 and March 2013 during the autumn and winter (dry and regular respectively with regard to hydrological characteristics) in 2 years. No differences in glass eel catches were observed between fishing seasons; however, a higher number of non-target species was observed in 2012–13 (regular year). There was higher species diversity in the regular year, as well as the highest number of individuals. Higher catches of the most abundant species were also observed in the regular year, compared with the dry year, suggesting that the magnitude of the effect of these illegal practices is related to hydrological cycles. Despite the low replication (2 years), the present study shows that non-selective practices have considerable effects on the species captured, as well as on the functioning of the estuarine ecosystem.
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Huda, Samsul, Siti Naviah, and Natasya Habibah. "Prayang Innovation Technology on Capture Results." Jurnal Perikanan dan Kelautan 25, no. 3 (November 23, 2020): 179. http://dx.doi.org/10.31258/jpk.25.3.179-183.
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Prayang is traditional fishing gear, a prohibition on the use of cantrang fishing gear by the Ministry of Maritime Affairs and Fisheries (KKP) requires an alternative replacement fishing gear, considering that the condition of the Java sea waters is already overfished. The study aims to determine the effect of using different color lights on prayang fishing gear on catches. The research method is an experiment by applying "light fishing" technology. The initial stage of the study was the use of lighting aids with different colors. Based on the results of statistical tests the lamp color treatment had no significant effect, the catch was dominated by white shrimp species for the use of white light and the shrimp continued to prefer green.
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Zhang, Jie, Donlin Fan, Hongchang He, Bin Xiao, Yuankang Xiong, and Jinke Shi. "Forecasting Albacore (Thunnus alalunga) Fishing Grounds in the South Pacific Based on Machine Learning Algorithms and Ensemble Learning Model." Applied Sciences 13, no. 9 (April 28, 2023): 5485. http://dx.doi.org/10.3390/app13095485.
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To achieve high-precision forecasting of different grades of albacore fishing grounds in the South Pacific Ocean, we used albacore fishing data and marine environmental factors data from 2009 to 2019 as data sources. An ensemble learning model (ELM) for albacore fishing grounds forecasting was constructed based on six machine learning algorithms. The overall accuracy (ACC), fishing ground forecast precision (P) and recall (R) were used as model accuracy evaluation metrics, to compare and analyze the accuracy of different machine learning algorithms for fishing grounds forecasting. We also explored the forecasting capability of the ELM for different grades of fishing grounds. A quantitative evaluation of the effects of different marine environmental factors on the forecast accuracy of albacore tuna fisheries was conducted. The results of this study showed the following: (1) The ELM achieved high accuracy forecasts of albacore fishing grounds (ACC = 86.92%), with an overall improvement of 4.39~19.48% over the machine learning models. (2) A better forecast accuracy (R2 of 81.82–98%) for high-yield albacore fishing grounds and a poorer forecast accuracy (R1 of 47.37–96.15%) for low-yield fishing grounds were obtained for different months based on the ELM; the high-yield fishing grounds were distributed in the sea south of 10° S. (3) A feature importance analysis based on RF found that latitude (Lat) had the greatest influence on the forecast accuracy of albacore tuna fishing grounds of different grades from February to December (0.377), and Chl-a had the greatest influence on the forecast accuracy of albacore tuna fishing grounds of different grades in January (0.295), while longitude (Lon) had the smallest effect on the forecast of different grades of fishing grounds (0.037).
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Takashina, Nao. "On the spillover effect and optimal size of marine reserves for sustainable fishing yields." PeerJ 8 (August 25, 2020): e9798. http://dx.doi.org/10.7717/peerj.9798.
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Marine reserves are an essential component of modern fishery management. Marine reserves, which represent a management tradeoff between harvesting and conservation, are fundamental to maintenance of fisheries. Finding optimal reserve sizes that improve fishing yields is not only of theoretical interest, but also of practical importance to facilitate decision making. Also, since the migratory behavior of some species influences the spillover effect of a marine reserve, this is a key consideration when assessing performance of marine reserves. The relationship between optimal reserve size and migration rate/mode has not been well studied, but it is fundamental to management success. Here, I investigate optimal reserve size and its management outcome with different levels of spillover via a simple two-patch mathematical model. In this model, one patch is open to fishing, and the other is closed. The two-patch model is aggregated by single-population dynamics when the migration rate is sufficiently larger than the growth rate of a target species. At this limit, I show that an optimal reserve size exists when pre-reserve fishing occurs at fishing mortality larger than fMSY, the fishing mortality at the maximum sustainable yield (MSY). Also, the fishing yield at an optimal reserve size becomes as large as MSY at the limit. Numerical simulations at various migration rates between the two patches suggest that the maximum harvest under management with a marine reserve is achieved at this limit. This contrasts with the conservation benefit which is maximized at an intermediate migration rate. Numerical simulations show that the above-mentioned condition for an optimal reserve size to exist derived from the aggregated model is necessary when the migration rate is not sufficiently large, and that a moderate migration rate is further necessary for an optimal reserve size to exist. However, high fishing mortality reduces this requirement.
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Kang, Seok-Kyu. "Economic Effect of Mongsanpo Fishing Village Tourism Festival." Journal of Fisheries Business Administration 53, no. 3 (September 30, 2022): 17–26. http://dx.doi.org/10.12939/fba.2022.53.3.017.
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Kaiser, M. J., H. Hinz, R. M. Callaway, A. Nall, and C. L. Biles. "Resource degradation: a subtle effect of bottom fishing." Marine Biology 146, no. 2 (August 20, 2004): 401–8. http://dx.doi.org/10.1007/s00227-004-1440-5.
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Shepperson, Jennifer L., Niels T. Hintzen, Claire L. Szostek, Ewen Bell, Lee G. Murray, and Michel J. Kaiser. "A comparison of VMS and AIS data: the effect of data coverage and vessel position recording frequency on estimates of fishing footprints." ICES Journal of Marine Science 75, no. 3 (December 26, 2017): 988–98. http://dx.doi.org/10.1093/icesjms/fsx230.
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Abstract Understanding the distribution of fishing activity is fundamental to quantifying its impact on the seabed. Vessel monitoring system (VMS) data provides a means to understand the footprint (extent and intensity) of fishing activity. Automatic Identification System (AIS) data could offer a higher resolution alternative to VMS data, but differences in coverage and interpretation need to be better understood. VMS and AIS data were compared for individual scallop fishing vessels. There were substantial gaps in the AIS data coverage; AIS data only captured 26% of the time spent fishing compared to VMS data. The amount of missing data varied substantially between vessels (45–99% of each individuals' AIS data were missing). A cubic Hermite spline interpolation of VMS data provided the greatest similarity between VMS and AIS data. But the scale at which the data were analysed (size of the grid cells) had the greatest influence on estimates of fishing footprints. The present gaps in coverage of AIS may make it inappropriate for absolute estimates of fishing activity. VMS already provides a means of collecting more complete fishing position data, shielded from public view. Hence, there is an incentive to increase the VMS poll frequency to calculate more accurate fishing footprints.
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Zhou, Shijie, Ross M. Daley, Michael Fuller, Cathy M. Bulman, and Alistair J. Hobday. "A data-limited method for assessing cumulative fishing risk on bycatch." ICES Journal of Marine Science 76, no. 4 (January 28, 2019): 837–47. http://dx.doi.org/10.1093/icesjms/fsy206.
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Abstract To assess fishing effects on data-poor species, impact can be derived from spatial overlap between species distribution and fishing effort and gear catchability. Here, we enhance the existing sustainability assessment for fishing effect method by estimating gear efficiency and heterogeneous density from sporadic catch data. We apply the method to two chondrichthyan bycatch species, Bight Skate and Draughtboard Shark in Australia, to assess cumulative fishing mortality (Fcum) from multiple fisheries. Gear efficiency is estimated from a Bayesian mixture distribution model and fish density is predicted by a generalized additive model. These results, combined with actual fishing effort, allow estimation of fishing mortality in each sector and subsequently, the Fcum. Risk is quantified by comparing Fcum with reference points based on life history parameters. When only the point estimates were considered, our result indicates that for the period 2009 and 2010 Bight Skate caught in 14 fisheries was at high cumulative risk (Fcum ≥ Flim) while Draughtboard Shark caught by 19 fisheries was at low cumulative risk (Fcum ≤ Fmsy). Because of the high cost of conducting cumulative risk assessments, we recommend examining the distribution of fishing effort across fisheries before carrying out the assessments.
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Prasetyo, Andhika Prima, and Rudy Masuswo Purwoko. "INTER-SPECIFIC COMPETITION AND FISHING EFFECT TO POPULATION DYNAMIC OF BALI SARDINE (SARDINELLA LEMURU)." Indonesian Fisheries Research Journal 22, no. 2 (January 24, 2017): 85. http://dx.doi.org/10.15578/ifrj.22.2.2016.85-90.
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Stock-recruitment relationship of Bali sardine was investigated based on Beverton-Holt model by assuming inter-specific competition. Model is modified to incorporate the effect of fishing pressure that is density-independent to population dynamic by developing scenario fishing on adult and/or juvenile population. The results show that harvested adult the dramatic decline of recruitment supply. However, harvested juvenile is led to the positive response to population size, as an increase in fishing mortality rate will reduce competition mortality rate. Precautionary approach required by considering bipartite life cycle.
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OLU, Joshua, Anuoluwapo OLAPEJO, Damilare A. ADETUNJI, and Olusegun A. ADETUNJI. "Assessment of Climate Change Variables Impact on Fishing Livelihood of some Fishing Communities in Badagry Local Government Area of Lagos, Nigeria." Environmental Studies Journal 2, no. 1 (December 20, 2023): 13–32. http://dx.doi.org/10.36108/esj/3202.20.0120.
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This study examined the impact of climate change variables on fishing livelihood in some communities in Badagry Local Government Area of Lagos State, Nigeria. It utilized a well-structured questionnaire that was distributed among the 306 respondents randomly to inquire into the demographic, fishing activities, perception on climate change and adaptation mechanism of respondents to climate change. It was found that 86.3% of the respondents were familiar with the climate change variables such as rainfall, windfall, drought etc. Also, 92.5%, and 85.8% of the respondents claimed to know that erratic rainfall and temperature respectively is due to climate change and affected their fishing activities. The perception of the respondents on the climate variability impact on the fishing activities has nothing to do with their gender at t (238) = -1.440, p = 0.151. A significant correlation was discovered in the perceived climate change variables and their effect on the fishing activities of the fisher folks in each of the communities (r =0.274; p<0.05). Perceived oscillation of unusual dry and wet season in the past few years was significant, c2 (1, N = 240) = 86.40, p<0.05 with the fishing activities and income. Lastly, Employment status, annual income and education share a non-significant relationship [F (2, 240) = 0.171, p=0.843] to swift adaptation to climate variable effects among the fish farmers. In conclusion, reduction in the fishing activities livelihood and income of the fisher folks in the communities has been ascribed to the effect of climate change variables.
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Dowling, Natalie A., Stephen J. Hall, and Richard McGarvey. "Simulations of random fishing behaviour as an independent validation for the effect of active targeting of greenlip abalone (Haliotis laevigata) aggregations." Canadian Journal of Fisheries and Aquatic Sciences 61, no. 2 (February 1, 2004): 260–72. http://dx.doi.org/10.1139/f03-164.
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Although active targeting of abalone aggregations is documented for various species, its impact on large aggregations is poorly understood. As large aggregations make the greatest contribution to reproductive success, yet are vulnerable to exploitation, it is important to understand how targeted fishing impacts aggregation structure. If observed postfishing patterns are equally likely to have occurred in response to more random, nontargeted fishing, then changes in aggregation patterns cannot be directly attributed to aggregation-based targeting behaviour. The effect of targeted fishing on greenlip abalone (Haliotis laevigata) aggregations was verified by simulating three different levels of "random" fishing behaviour to generate postfishing aggregation frequency distributions. Comparison of the output with postfishing survey distributions suggested that observed aggregation patterns could not have resulted from random search behaviour. The aggregation survey data can therefore be used as a valid basis on which to quantify both fishing behaviour in terms of aggregation-specific catch patterns and the response of aggregations to fishing.
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Darton, Darton, Sri Wiyati Mahrani, Ansir Ansir, Aidin Hudani Awasinombu, and Rachmat Rialdi Hasan. "PENGARUH KEPEMIMPINAN TRANSFORMASIONAL DAN MOTIVASI KERJA TERHADAP KINERJA KARYAWAN PADA KANTOR PELABUHAN PERIKANAN SAMUDERA KENDARI." Jurnal Manajemen dan Kewirausahaan 14, no. 2 (July 30, 2022): 468. http://dx.doi.org/10.55598/jmk.v14i2.27095.
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This study aims (1) to determine the effect of transformational leadership and work motivation on employee performance at the ocean kendari fishing port office, (2) to determine the effect of transformational leadership influence on employee performance at the kendari ocean fishing port office, (3) to determine the effect of motivation work on employee performance at the Kendari Ocean Fishery Port Office. The object of this research is the employee at the Kendari Ocean Fishery Port Office. The population in this study were employees at the Kendari Ocean Fishery Port office, amounting to 80 people, because the population was less than 100 people, the sample of this study was 80 office employees at the Kendari Ocean Fishing Port as respondents. The research data was collected using a questionnaire, the research data was analyzed using Multiple Linear Regression through SPSS 21 software. The results of this study (1) Simultaneously transformational leadership and work motivation have a positive and significant effect on employee performance at the ocean kendari fishing port office, (2) transformational leadership has a positive and significant effect on employee performance at the kendari ocean fishing port office, (3) motivation Work has a positive and significant effect on employee performance at the Kendari Ocean Fishery Port Office.
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Mefo, U. Ekine, Ifeanyi-Amos D.I., Okidim E., I. A., and A. A. Okuduwor. "Effect of Crude Oil Pollution on Artisanal Fishing in Asari- Toru, Akuku-Toru and Degema Local Government Areas of Rivers State, Nigeria." International Journal of Agriculture and Earth Science 8, no. 6 (August 26, 2023): 15–22. http://dx.doi.org/10.56201/ijaes.v8.no6.2022.pg15.22.
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This study analyzed the effect of crude oil production on artisanal fishing in selected local government areas of Rivers State. Purposive and random sampling technique were used in selecting respondents for the study. The sample size for the study was made up of 90 artisanal fishing folks. Data were elicited from fishing folks with a structured questionnaire which were administered to the respondents. Percentage, mean, costs and returns and multiple regression were used for the analyses of data. The result showed that the mean age of respondents was 40 years, while the mean house hold size was 6 persons. The result also showed that majority of the respondents had primary education and that most respondents had no access to credit facilities to enable them purchase fishing equipment for their operations. Also, majority (66.7%) were members of cooperative society while majority (71%) reported incidence of oil spillage in the study area. The regression analysis also revealed that the output of individual fishing households is significantly influenced by variables, namely, capital, labour, operating costs, fishing experience and oil spill. There is the need for policies that could compel oil companies to minimize oil spill in the farmers’ fishing environment.
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Clarke, Sarah, and Oliver Tully. "BACI monitoring of effects of hydraulic dredging for cockles on intertidal benthic habitats of Dundalk Bay, Ireland." Journal of the Marine Biological Association of the United Kingdom 94, no. 7 (June 16, 2014): 1451–64. http://dx.doi.org/10.1017/s0025315414000630.
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Hydraulic dredging for bivalves, such as cockles (Cerastoderma edule), has the potential to cause significant impacts on marine intertidal benthos. Although this fishing activity is common in northern European Natura 2000 sites such impacts may be incompatible with conservation objectives for designated habitats and species within these sites. In 2009–2010 a spatially nested control-impact study was undertaken before (t0), 8–9 days after (t1) and 4 months (t2) following dredging and extraction of 108 tonnes of cockles from a standing stock of 2158 tonnes in Dundalk Bay. This study failed to detect significant effects on benthic sediments, or the overall community structure. However, a fishing effect on the target species C. edule in one sampling area and a short lived effect on the bivalve Angulus tenuis were identified. Significant spatial and temporal variability in abundance of species and taxonomic groups, unrelated to fishing effects, was observed. Previous studies on the effects of fisheries on marine intertidal benthos have reported variable results, related to study design and objectives and the physical characteristics of the study site. Site specific studies, relative to the intensity and frequency of proposed fishing activity, may be required to adequately inform managers whether such activities are compatible with specific conservation objectives for Natura 2000 sites.
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Avilés-Polanco, Gerzaín, Marco Antonio Almendarez-Hernández, Luis Felipe Beltrán-Morales, and Fernando Aranceta-Garza. "Cost Efficiencies of the Shrimp Fishery in Mexico: A Stochastic Frontier Analysis." Fishes 8, no. 9 (September 21, 2023): 472. http://dx.doi.org/10.3390/fishes8090472.
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Fishing sector fuel subsidies are designed to increase profitability by reducing costs. However, despite the number of liters of fuel subsidized in 2018 in Mexico, there is no information available on the effectiveness of the subsidies in reducing cost inefficiencies. The purpose of this study was to estimate the cost efficiency of shrimp fishing companies in Mexico, as well as measure the impact of fuel subsidies on the cost inefficiency of the sector from 2003 to 2018. The True Fixed Effects model was used to represent a Cobb–Douglas stochastic production frontier, which included a shrimp fishing inefficiencies model. The results indicate that shrimp fishing companies could reduce their costs by 25% without reducing their catch levels. Fishing companies in the Gulf of Mexico were more efficient than those operating in the Gulf of California and the South Pacific. Fuel subsidies reduce cost inefficiencies, with a greater effect when the subsidy reaches a level of 20% of the total liters of subsidized fuel.
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Sbm, Nugroho, Deden Diner Iskandar, and Waridin Waridin. "The Effect of Environmentally Unfriendly Fishing Gear on The Welfare of Fisher in Morodemak Village, Demak Regency." International Journal of Environmental Engineering and Development 2 (July 2, 2024): 184–94. http://dx.doi.org/10.37394/232033.2024.2.16.
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This study aims to see the effect of the use of fishing gear that is not environmentally friendly on the welfare level of fisher in Morodemak Village, Demak Regency. The method used in this study is a snowballing technique for sample collection through interviews so that 50 respondents are obtained, then the analysis method used is cross-tabulation and descriptive statistics. The results of this study found that the majority of Morodemak fisher use environmentally unfriendly fishing gear such as sodo, large trawls, especially small trawls. The use of environmentally unfriendly fishing gear by the majority of fisher certainly damages the marine ecosystem, but the fishing gear is still considered effective for obtaining abundant catches that affect the welfare of fisher.
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Keppeler, Friedrich Wolfgang, Gustavo Hallwass, and Renato Azevedo Matias Silvano. "Influence of protected areas on fish assemblages and fisheries in a large tropical river." Oryx 51, no. 2 (June 15, 2016): 268–79. http://dx.doi.org/10.1017/s0030605316000247.
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AbstractProtected areas are one of the main tools for biological conservation worldwide. Although they have contributed to an increase in fish abundance and alleviated the impacts of fishing on marine ecosystems, the impacts of fishing and of protected areas in freshwater ecosystems are less well known. We compared fishing productivity and fish assemblage descriptors of two distinct protected areas designated for sustainable use of natural resources and an unprotected area in the Tapajós River, in the Brazilian Amazon. Two hypotheses were tested: (1) fishers from protected areas have higher catch per unit effort than those from unprotected areas; and (2) fish assemblages in protected areas have higher biomass, abundance, presence of target species, species richness, fish size and mean trophic level than those in unprotected areas. A total of 2,013 fish landings were recorded and two surveys were undertaken to sample fishes. Eleven environmental parameters were quantified to distinguish between effects of environmental heterogeneity and protected areas. The catch per unit effort of fishers was higher within protected areas than in unprotected areas, suggesting that protected areas reduce the levels of fishing pressure and increase fishing productivity. However, the fish assemblage descriptors were correlated more with environmental variables than with protected areas, indicating a relatively weak effect of protected areas on fish communities in lakes. The results highlight the importance of considering the influence of environmental heterogeneity in fish conservation programmes, and the positive effect of protected areas on fishing productivity in freshwater environments.
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Purnama, Nanda Rizki, Rianjuanda Rianjuanda, Alga Armansyah, Edy Miswar, Chaliluddin Chaliluddin, and Kavinta Melanie. "The Effect of Using Ordinary Lights and Petromak Lights in Hands Fishing Tools on the Types of Catches in Simeulue Waters." Jurnal Kelautan dan Perikanan Indonesia 3, no. 1 (April 10, 2023): 11–19. http://dx.doi.org/10.24815/jkpi.v3i1.31516.
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The development of hand line fisheries has not experienced much significant progress when compared to other fishing gear. The effectiveness of handline is determined by its design and construction, operation does not require large capital, handline fishing also uses aids such as bait and FADs. The use of light in handline fishing gear to attract phototactic fish. The research objectives were to determine the type and weight of fish caught on handline fishing gear using two different types of lights and to determine the effect of regular light and petromax on fish caught using handline fishing gear in Simeulue Waters. The research was carried out in October 2022, in Simeulue Waters, Simeulue Regency, East Simeulue District, Sinabang City. The types of data collected in this study were primary and secondary data obtained from experimental fishing methods. The effect of giving light to the catch in hand line fishing gear can be known by the data obtained from direct observation data. The weight of fish caught using ordinary lamps is at least 1840 grams and the maximum weight is 9460 grams, while using petromax lamps the fish weighs at least 1330 kg and the largest catch is 9490 kg. The research results showed that there were no differences that had a significant effect on hand line catches, so do a statistical analysis using the t test with the result -.161.Keywords: catch, hand line, light, Simeulue
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TSUMURA, Ryosuke, Nobuo KIMURA, Yasuzumi HUJIMORI, and Toshihiro IWAMORI. "Effect of the Motion Reduction Mooring Device for Fishing Work in the Scallop Cultivation Fishing Boat." Journal of Japan Institute of Navigation 116 (2007): 243–48. http://dx.doi.org/10.9749/jin.116.243.
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Pham, Ca-Van, Hui-Cheng Wang, Sheng-Hung Chen, and Jie-Min Lee. "The Threshold Effect of Overfishing on Global Fishery Outputs: International Evidence from a Sustainable Fishery Perspective." Fishes 8, no. 2 (January 24, 2023): 71. http://dx.doi.org/10.3390/fishes8020071.
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Using global fishery outputs from 62 countries during the period 2001–2020, this study applies the threshold panel data model of Hansen (2000) to empirically explore the nonlinear relations between the number of fishing vessels, fishers, and fishery production, with distinct overfishing stocks (overfishing) and fish caught by trawling or dredging techniques (trawling) as the threshold variables. Our findings show that the levels of fishery outputs could be increased by different combinations of primary factors, such as the number of fishing vessels and fishers. More specifically, when the number of fishing vessels and fishermen operating in countries with a high ratio of overfishing (overfishing > 4.4456) increased, their fishery outputs significantly increased as compared with countries with a low percentage of overfishing. As overfishing activities increase, they can result in significant shortages and imbalances of fishery resources, directly influencing fish biomass, biodiversity, and sustainability of fisheries, as well as making destructive fishing practices worse for marine ecosystems. Countries with a relatively high proportion of trawler net usage (trawling > 4.5516) would have significantly lower fishery outputs, as more fishing vessels are invested in them, compared with countries with a low proportion of trawling net use. This implies that trawler net usage is a non-sustainable fishing technique and harms fishery resources. The policy implications of this study indicate that taxing overfished species and implementing trawling regulations could significantly improve species richness and site-based abundance, thus helping to sustain fishery outputs.
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Marçalo, Ana, Tiago A. Marques, João Araújo, Pedro Pousão-Ferreira, Karim Erzini, and Yorgos Stratoudakis. "Fishing simulation experiments for predicting the effects of purse-seine capture on sardine (Sardina pilchardus)." ICES Journal of Marine Science 67, no. 2 (November 4, 2009): 334–44. http://dx.doi.org/10.1093/icesjms/fsp244.
Full textAbstract:
Abstract Marçalo, A., Marques, T. A., Araújo, J., Pousão-Ferreira, P., Erzini, K., and Stratoudakis, Y. 2010. Fishing simulation experiments for predicting the effects of purse-seine capture on sardine (Sardina pilchardus). – ICES Journal of Marine Science, 67: 334–344. To study the impact of purse-seine fishing on deliberately released sardine, two laboratory experiments were performed to explore the effect of net confinement for 10, 20, 40, and 60 min at 18 and 23°C. A third experiment considered two levels of fish density while confined for 20 and 40 min at 16°C. Analysis of cortisol and haematocrit demonstrated that stress immediately after simulated fishing was milder than in commercial fishing and did not correlate with observed delayed mortality. Scale loss was related to the probability of dying (mean values of 16.3 and 2% for dead fish and survivors, respectively), and fin erosion was a long-term stress response observed in both dead and surviving fish. Time of confinement was an important stressor, with survival rates decreasing significantly with increasing periods in the net, and temperature having an additional negative effect. Density effects were less conclusive, but there was some indication that survival correlated with biological condition (heavier fish were more likely to survive). It seems that delayed mortality after release can be substantial, although death is not certain and appropriately modified fishing operations and favourable environmental conditions may enhance the probability of sardine survival.