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Artykuły w czasopismach na temat "Fish landing"
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Mustaruddin, Mustaruddin, Eno Selomita, Thomas Nugroho i Sri Susanti Kartini. "Segi Sanitasi pada Pendaratan Ikan Tuna di Pelabuhan Perikanan Samudera Bungus, Sumatra Barat". Jurnal Ilmu Pertanian Indonesia 27, nr 4 (7.10.2022): 536–43. http://dx.doi.org/10.18343/jipi.27.4.536.
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Clean and hygienic fish landings to meet sanitation requirements and guarantee the quality of the fish caught are an important part of the role of the fishing ports. However, it has not been done much at Bungus PPS, which was marked by the handling of fish quality that was not standardized, some unloading equipment and transportation facilities were rarely cleaned, and the environmental quality at the fish landing dock was not maintained. The study aimed to evaluate the quality control level of tuna fish, the performance of fish landing sanitation, and estimate the potential losses from neglected fish landing sanitation. The study used the scoring system, p control chart analysis, regression method, and profit/loss analysis. Organoleptically, the quality of tuna landed on Bungus PPS was at 7.50‒7.77 (fresh enough to fresh). The quality of tuna was still under control, with the value of upper control limit (UCL) = 0.220, central line (CL) = 0.07 and lower control limit (LCL) = 0.000. The sanitation performance of fish landings on PPS Bungus was around 3,45 (scale 1-5). Sanitation of fish handling (x) significantly affects the quality of tuna caught (y), which was indicated by the equation y = 0,1308x + 7,175. The sanitation conditions explained that 84.4% of the tuna caught were maintained. Potential losses from neglected landing sanitation were (a) the loss of the best-selling price of tuna and (b) the cost of nutrition consultation and disease management due to damage to the nutritional content of tuna.
Keywords: bungus, tuna caught, fishing port, fish landing sanitation
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Mohamed, Abdul-Razak M., i Abdullah N. Abood. "Current status of Iraqi artisanal marine fisheries in northwest of the Arabian Gulf of Iraq". Archives of Agriculture and Environmental Science 5, nr 4 (25.12.2020): 457–64. http://dx.doi.org/10.26832/24566632.2020.050404.
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The study was conducted to analyze the fish landings from Iraqi artisanal marine fisheries, northwest Arabian Gulf from January 2017 to December 2019. The monthly data of fish landings were collected from the main landing site at Al-Fao port, south Iraq and were analyzed using descriptive statistics. A total of 35 taxa in 18 families were identified in the artisanal catches, in addition to two species of shrimps. The highest total landings were 11,944 t in 2018 and 11,305 t in 2019. The annual total landing of the marine fisheries increased by 270% during 2017-2019 as compared with the annual landing during 2008-2016. Threadfin bream contributed 14.1%, followed by river shad (11.1%) and mullets (11.1%), whereas shrimps formed 15.2% to the total catch. The overall values of biomass diversity of fish ranged from 1.82 in 2017 to 2.85 in 2018. There were 320 registered fishing boats motorized by 65 to 950 hp. Multi gears fishing were observed. The trends of the landings of all fish groups were increased substantially, except river shad, threadfin bream and shrimps. The study suggests some of the management measures must be put into place, especially for the river shad in the regions of their migration reproductive and the nursery.
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Nasir, N. A., i Q. M. Sultan. "A survey of the availability of fish species in the landing centers of Dhi-Qar Province, Iraq, during the period from 2005 to 2016". Mesopotamian Journal of Marine Sciences 33, nr 2 (10.12.2021): 83–90. http://dx.doi.org/10.58629/mjms.v33i2.52.
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The current study was designed to evaluate the landing and distribution pathways of fish in DhiQar during the period from 2005 to 2016. This investigation was carried out to overview the location of the fish landing/entering centers, the source of supply and availability of fisheries organisms in DhiQar Province. Gill net, seine net, cast net and electro-fishing gears were used mainly for catching the freshwater fish. The total fish landing in the province during the above mentioned period was about 37427 tons. The maximum landed was about 4245 tons during 2016 which accounted for about 11% of the total catch. Out of thirteen freshwater fish species, 3 were marine fish species, the total landed fish was dominated by the less economically fish such as Palaniza abu which accounted for about 44 % of the total catch. Alternatively, the highly economically fish were landed in a less amount throughout the time studied. Seven native fish species were recorded during the study which made up of 67 % of the total catch. The alien species were 3 and made about 21 % of the total fish landed. Migratory species were occurred at the lowest level and formed about 12 % of the total catch. It could be concluded that most quantities of fish landings in the fish markets has always come from the captured fisheries, the rest were coming from aquaculture production.
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Lau, Z. Y., i Azhar Ghazali. "A study on the design strategies of Fish Landing Jetty Complexes in Malaysia to enhance the efficiency of the building". IOP Conference Series: Earth and Environmental Science 881, nr 1 (1.11.2021): 012049. http://dx.doi.org/10.1088/1755-1315/881/1/012049.
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Abstract Malaysia has a booming and successful fishery development. Fisheries Development Authority of Malaysia Complexes (LKIM) are located in every state of Malaysia to function as a fish landing jetty complex to allow fishing vessels for fish handling operations. However, the design and facility of Fish Landing Jetty Complexes in Malaysia are not up to date even though the fishery development contribute to Malaysia’s economy. Proper facilities and design strategies of fish landing jetty will ensure that fish handling operations work efficiently and enhance the fishery development in Malaysia. In this research, the design components and facilities of fish landing jetty complexes are studied for determining the design strategies of fish landing jetty complexes in Malaysia to enhance the efficiency of the building itself. In this research, a few precedent study and survey questionnaire had been conducted as a research methodology to review and compare the design components and facility of the precedent studies. Besides, the survey questionnaire is to collect the data and their opinion from the general public and users of the Fish Landing Jetty Complex to understand their satisfaction and expectation towards the current condition of the Fish Landing Jetty Complex in Malaysia. There are 41% of respondents are stated that majority of the Fish Landing Jetty Complexes in Malaysia are unsuccessful in achieving the efficiency of the fish landing process. The design strategies of Fish Landing Jetty Complex should consider on the working flow diagram of fish landing. Application of mechanical quay-side lifting winches, built-in conveyor system, rainwater harvesting system and solar energy able to increase the efficiency of the building. It is important to apply the commercial and public recreation spaces inside a Fish Landing Jetty Complex to sustain longer and produce revenue to the building.
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Sambuo, Damian Boniface, Stephen Kirama i Kitala Malamsha. "Fish Price Determination Around Lake Victoria, Tanzania: Analysis of Factors Affecting Fish Landing Price". Global Business Review 22, nr 2 (kwiecień 2021): 348–63. http://dx.doi.org/10.1177/0972150918811509.
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Determination of fish landing price is important, as the same contributes to the structure, conduct and performance of the fish market in Lake Victoria. Determination of relevant landing price is a gap to console between fishermen, agents (middlemen), processors and the government. The main objective of this study was therefore to examine fish price determination. Specifically, to examine the methods for fish price determination and analyse factors that affect fish landing price in Lake Victoria, a cross-sectional design was employed, and 300 respondents were randomly selected from two district councils, namely, Sengerema and Buchosa. Both qualitative and quantitative data were analysed using descriptive statistics and inferential analysis. Findings show that landing price is determined through formal negotiation with processors, consultation with other traders, informal negotiation with buyers and Beach Management Unit (BMU). The study concluded that these are the common methods used to determine landing prices. Also, distance from fishing to onshore landing centres, market information channels, age and experiences of the fishermen are the factors significantly found affecting landing price. It is recommended that the mechanism for setting up fishery price, fish market structure, fishery information and the formation of fishery regulatory body needs fishery policy and sector reforms that mark the determination of fish landing price.
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Harryes, Regil Kentaurus, i Laksmi Sulmartiwi. "Management Governance of Fish Landing in Fish Landing Officer (PPI) Gorontalo City, Gorontalo." Journal of Marine and Coastal Science 8, nr 2 (4.08.2020): 80. http://dx.doi.org/10.20473/jmcs.v8i2.21152.
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Port infrastructure development is the main role to expand fishery. Therefore, Indonesian government pays attention in sailing products, where establishing fish market leads the appropriate program of government. And, Gorontalo is one of city with a coastal area and estuary with a fish landing and marketing site or Pangkalan Pendaratan Ikan (PPI). The Field Work Practice was held at Gorontalo City, District Hulondhalangi, Under the Guidance of the Department of Marine and Fisheries Gorontalo City Gorontalo province for thirty-six days from the date of January 18 to February 22. The results showed in this field practice is the flow of fish landing on PPI Gorontalo city has a shortage in the recording process and the results are less comprehensive infrastructure, the PPI Gorontalo city, there are 3 kinds of models of marketing channels.
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Idrus, Muhamad Amril, Krisnawan Nandito i Annisa Megia Sari. "Catch Fish Profile at Amagarapati Fish Landing Port, East Flores Regency, East Nusa Tenggara Province". Omni-Akuatika 18, S1 (18.04.2022): 24. http://dx.doi.org/10.20884/1.oa.2022.18.s1.975.
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East Nusa Tenggara (NTT) Province has many business potentials in the marine and fisheries sectors, especially fish as a commodity. East Flores District is one of the fish landing centers for fishing vessels in the East Nusa Tenggara Province. The objective of this study was to determine the activities of fishing vessels and to find out the catches that have been landed at Amagarapati Fish Landing Port. The location of this study was determined by purposive sampling, while the research location was carried out at Amagarapati Fish Landing Port. This research was conducted in July-October 2021. A descriptive survey was chosen as the data collection method by conducting direct observations in the field such as giving interviews and distributing questionnaires to the fishermen and Amagarapati Fish Landing Port’s employees. The results of this study showed that fishing activities at Amagarapati Fish Landing Port were running normally as usual even though Implementation of restrictions on community activities (PPKM) was implemented in East Flores Regency, the fish caught were dominated by Skipjack, Mackerel Tuna, Tuna, Mackerel Scad, and Atlantic Menhaden. There was an obstacle in the decline in fish prices due to the decline in people's purchasing power, tuna exports to the United States experienced a decline due to the lockdown destination countries. The catch that landed at Amagarapati Fish Landing Port 2,527.5 Tons of catches were reduced due to bad weather, the availability of fish bait for pole and line vessels was limited so that it hampered fishing activities.Keywords: Amagarapati Fish Landing Port, Fish Catch, and Fishing Vessels
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Ardiansyah, Muhammad. "ANALISIS PEMANFAATAN FASILITAS PANGKALAN PENDARATAN IKAN KASIWA KABUPATEN MAMUJU PROVINSI SULAWESI BARAT". JOURNAL OF INDONESIAN TROPICAL FISHERIES (JOINT-FISH) : Jurnal Akuakultur, Teknologi Dan Manajemen Perikanan Tangkap, Ilmu Kelautan 5, nr 1 (23.06.2022): 62–72. http://dx.doi.org/10.33096/joint-fish.v5i1.118.
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This research was conducted from November 9, 2021, to December 09, 2021. This research aimed to determine the condition of the Kasiwa fish landing base facility, analyze the utilization of the Kasiwa landing base facility, Mamuju District, West Sulawesi province, as well as the development of the Kasiwa mamuju fish landing base facility. Data collection was carried out through a field survey. and interviews using a list of questions (questionnaires). Analysis of the data using the suitability analysis of the utilization of the Kasiwa mamuju fish landing base facility. The results of this study indicate that the utilization of the Kasiwa fish landing base facility in the Mamuju district is in good condition and it is necessary to develop the Kasiwa fish landing base facility to make it easier for fishermen to unload and handle the catch.
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Hannesson, R., i J. Kennedy. "Landing Fees versus Fish Quotas". Land Economics 81, nr 4 (1.11.2005): 518–29. http://dx.doi.org/10.3368/le.81.4.518.
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Nowsad, Alam AKM, Mousumi Akter i Al Shahriar. "Landing and distribution of captured fish in selected landing centers in Kishoreganj haor, Bangladesh". Asian-Australasian Journal of Bioscience and Biotechnology 6, nr 2 (31.08.2021): 75–88. http://dx.doi.org/10.3329/aajbb.v6i2.56143.
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The present study illustrates species diversity, landing quality and catch composition of fish in 10 fish landing centers of 5 haor upazilas of Kishoreganj haor for 12 months from January 2018 to December 2018. A total of 15 different types of fishing gears were detected to harvest fish in different stations throughout a year. Most of the fishing (46.88%) was conducted by small groups of 2 – 5 fishers, while 24.87% of the fishing was conducted by 6 – 10 fishers. The average depth of water in haor associated rivers and inundated lands during monsoon period varied from 4.87±0.99 to 15.2±6.71 and 2.6±0.55 to 6.2±2.68 feet respectively. Fifty different types of fish species were landed in the selected 10 landing centers, where both cultured fish and captured fish were present. Fishes under the Cyprinidae family included 9 species, viz. Labeo rohita. Gebelion catla, Cirrhinus cirrhosus, Labeo calbasu, Hypophthalmichthys nobilis, Hypophthalmichthys molitrix, Cyprinus carpio, Ctenopharyngodon idella, Labeo gonius covered a maximum of 12450.61±468.32 MT. The second largest landed fish under the family Schilbeidae included 4 species Silonia silondia, Mystus armatus, Mystus cavasius Pseudeutropius atherinoides. Other fish species landed were identified as: 4 species under the family Mastacembelidae, 2 species under Siluridae, 3 species under Clupidae, 1 species under Ambassidae, 2 species under Palaemonidae, 3 species under Channidae, 1 species under Gobidae, 2 species under Bagridae and 1 species from each of the family Heteropneustidae, Pangasiidae, Clariidae, Ailiidae, Botiidae, Nandidae, Cichlidae, Anabantidae, Osphronemidae, Ambassidae, Notopteridae, Notopteridae,Belonidae and Gobiidae. Highest number 14 species landed were under catfish category, followed by 9 species of major carp. The captured total fish landed in 10 landing centers in 12 month period accounted 12,574±1029.64 MT, but the cumulative total landed fish, including pond fish, was 15,795±1666061.93 MT, as calculated by 45 Aratdars of 10 landing centers. About 88.35% fishermen sold the captured fish at local arat, but the rest (11.65%) were sold to large traders (paiker), retailers and consumers. A 56.6% of the fishermen cleaned the captured fish by river water, while 43.4% fishermen did not use water for washing fish before selling. After harvest, 45.62% fishers used clean utensils for carrying fish to arat and 54.38% used uncleaned utensils. Average harvest per fishermen per day was 23.9 kg, of which 22.26 kg was sold in the market and 1.64 kg was used for own family consumption. Out of total fish landed, a 45.2% was transported by fish hold of the country boat, 21.9% by bamboo basket and 14.8% by plastic crate. Relatively small quantity of fish was transported by insulated ice box (4.7%), aluminum container (2.7%) and gunny bag (3.2%). A 32.6% fisherman used ice and 67.4 % fishermen did not use ice after harvesting of fish. During fishing season, fish and ice ratio used by the transporters was 2.62:1. The highest number of auctioneers were found in Chamra Ghat of Karimganj, while lowest were in Nikli, with an area of 55±1.44 and 25±8.42 decimal area per auctioneers being used for fish business. Asian Australas. J. Biosci. Biotechnol. 2021, 6 (2), 75-88
Rozprawy doktorskie na temat "Fish landing"
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Cotterell, Stephen Paul. "Fish landings, discards and benthic material from demersal trawling in the western English Channel (ICES VIIe)". Thesis, University of Plymouth, 2006. http://hdl.handle.net/10026.1/2751.
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This study examined the impact of inshore single boat otter trawling from Newlyn, Looe, Plymouth and Salcombe and pair boat demersal trawling from Looc and Plymouth on the benthic environment off the SW peninsula of the UK between 1998 and 2000. Fish and shellfish species (54 and 11 species respectively) were measured at sea and the non-fish material (124 species) was analysed later. Overall 79.8 % of the sample was landed fish and shellfish, 15.8 % was discarded fishes and 4.4 % was invertebrates and other material (by weight). Related information about the substrate and tide were generated from British Geological Survey data and a computer simulation of the maximum mean tidal strength. In agreement with the different abiotic regime, the dominant fishes were different in Newlyn and the other ports. According only to port, the Looe and Plymouth samples were not significantly different, either as full samples or for their fish and non-fish components. The Salcombe samples were not significantly different to those from Looc or Plymouth for the non-fish part of the sample. Including the type of trawling meant that the greatest similarity was for the non-fish part of the sample although the relative amounts of the components varied. The pair trawling samples contained more landed, less discarded and less non-fish material than their single boat equivalents. Pair trawl samples also contained fewer examples of large invertebrate species. Several within and between-species relationships were explored to assess the wider interpretation of the fish community data. This examined size of Raja spp., several predator-prey relationships and the utility of Marlhasterias glacialis as an indicator of fishing disturbance. Disturbance as measured by Abundance Biomass Comparison was similar whether according to the non-fish or full sample, and suggested that the whole region was relatively undisturbed (with Newlyn apparently the most impacted area). Analysis of the relative contribution of selected groups to taxonomic diversity showed the derived conservation priorities for 'orders' of fishes were Elasmobranches > Pleuronectiformes > Gadiformes. In general, the fact of 'losing' orders of fishes was more important for single rather than pair trawl samples, which suggests that single boat samples were collected from structurally more complex areas supporting a wider taxonomic diversity. The analysis of groups for conservation priority was also carried into the invertebrates with echinoderms being highly influential for Newlyn. Taxonomic diversity (A+ and A) was also proposed as an addition to the definition of 'Good Environmental Status' according to the proposed EU Marine Strategy Directive. When examining the abiotic and biotic data sets, the fish species bore the closest similarity to the abiotic data suggesting that much of the study area was dominated by similar invertebrate species that tended to be scavengers and in most analyses the positive influence of the voluntary Inshore Potting Agreement management regime was evident. In a novel analysis, there was broad agreement between the data and literature sources for the location of the fishes in relation to the substrates and for eight of the most commonly occurring species it was possible to be more precise in their substrate preferences than suggested from the literature. The landed fish part of the sample was shown to be a statistically good approximation of the landed part of the haul (for which the commercial data was known) in > 95 % of the hauls. Finally, data on the commercial landings for each port show that the boats sampled in this study were representative of these ports.
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ölander, kristian. "Produktutveckling för catch and release fiske : Ett redskap som underlättar landning av fisk". Thesis, Högskolan i Gävle, Design och formgivning, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-27060.
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Van, Beveren Elisabeth. "Population changes in small pelagic fish of the Gulf of Lions : a bottom-up control?" Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS040/document.
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La compréhension et la gestion des écosystèmes requièrent un maximum de connaissances sur les dynamiques de populations. Depuis 2007, la taille de la sardine (Sardina pilchardus) et de l’anchois (Engraulis encrasicolus) dans le Golfe du Lion a chuté tandis qu’au même moment, la population de sprat, qui a une faible valeur commerciale, a fortement augmenté. Les très forts enjeux économiques autour de ces espèces ont conduit au projet de recherche « EcoPelGol » dans lequel se situe cette étude portant sur les changements observés. La condition corporelle, la croissance ainsi que la structure en âge et en taille des sardines, des anchois et en partie des sprats ont été analysées sur les vingt dernières années. Alors qu’en 2005-2007, la situation semblait optimale pour les anchois et les sardines (taille et condition élevées), celle-ci s’est considérablement dégradée depuis 2008, l’anchois et la sardine étant significativement plus petits et plus maigres. De plus, une diminution de l’âge et de la croissance a été observée chez la sardine. Nous avons ensuite caractérisé les fluctuations des débarquements historiques (1865-2013) de l’anchois, de la sardine et du maquereau. La chute récente des débarquements a été mise en exergue, avec une situation inédite où la sardine est actuellement moins débarquée qu’avant les années 60, date à laquelle les débarquements ont fortement augmenté suite à un accroissement conséquent de l’effort de pêche. Bien que la majorité de la variance dans les séries de débarquements semble être engendré par les changements de l’effort de pêche, nous avons également observé une relation entre les débarquements et l’indice « Atlantic Multidecadal Oscillation » pour l’anchois et la sardine et avec le « Western Mediterranean Oscillation » pour l'anchois. Dans une troisième analyse, la pression de prédation du thon rouge sur l’anchois, la sardine et le sprat a été estimée pour voir si l’accroissement de la population du thon depuis 2007 lié à de nouvelle mesures de gestion a pu impacté les poissons petits pélagiques. Mais bien que la sardine et l’anchois soient les proies principales du thon, moins de 2% de leurs populations ont été consommés chaque année entre 2011-2013, et ce, sans sélectivité sur la taille de ces proies de la part du thon. Ainsi, le thon rouge n’a pas pu avoir un impact significatif sur la structure en taille ou les abondances des petits pélagiques. Dans le chapitre final, nous avons considéré la possible influence de pathogènes. Des analyses globales dirigées vers la détection des parasites, des bactéries et des virus ont été effectuées tout au long de l’année et ont révélées la présence ponctuelle et relativement faible de bactéries des genres Tenacibaculum et Vibrio et celle systématique de microparasites. Malgré l’impossibilité d’exclure leur pathogénicité, aucune lésion tissulaire n’a été attribuée à ces organismes, réduisant fortement la probabilité d’une épizootie. Nos travaux indiquent que les mécanismes « top-down », des pathogènes ou encore la pêche ne sont probablement pas les facteurs clés pour expliquer les changements observés chez les poissons petites pélagiques. À l'opposé, certains paramètres environnementaux ont expliqué une partie de la variabilité dans la condition corporelle des poissons et leurs débarquements. Nous concluons donc qu’un contrôle « bottom-up », et particulièrement un changement dans la quantité et/ou qualité du zooplancton, peut être la cause des phénomènes dans les populations des poissons petits pélagiques. Si cette thèse permet une avancée dans la compréhension de leur dynamique, des analyses complémentaires seront nécessaires pour confirmer notre hypothèse principale et pour estimer l’influence des autres facteurs agissant potentiellement en synergieKnowledge on population dynamics is key to the improvement of management and the understanding of ecosystem functioning. Since 2007, the size of sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus) in the Gulf of Lions (NW Mediterranean) has severely decreased, which has strongly affected the fisheries. Simultaneously, the commercially uninteresting sprat population increased remarkably. As the economic and ecological stakes are high, the EcoPelGol project of which this PhD is part was established. We first analysed the sardine, anchovy and (partially) sprat population for changes in body condition, growth and size and age structure over the last 20 years. We concluded that sardine and anchovy have had from 2008 onwards a distinctively poor body condition and size, and that sardine have also showed a concurrent decrease in age and growth. In contrast, both species were in optimal and average “health” during 2005-2007 and 1992-2004, respectively. Subsequently, historical landings of sardine, anchovy and mackerel were considered (1865-2013), of which the fluctuations were characterised and statistically related to environmental variables. The recent dramatic landings decrease was put into perspective, as for example sardine is now for the first time landed less than before the 1960s, when a big probably effort-related upsurge occurred. Despite most of the variability being explained by what looks like changes in fishing effort, a link was found between the sardine and anchovy landings and the Atlantic Multidecadal Oscillation and the anchovy landings and the Western Mediterranean Oscillation. Next, as a management associated bluefin tuna increase also happened since 2007, its predation pressure on all three small pelagic species was estimated. We concluded that although sardine and anchovy are bluefin tuna’s main prey items, less than 2% of each population (including sprat) was consumed annually during 2011-2013 and that there was no clear size selectivity. Thus, tuna could not have had a noticeable impact on the population abundance or size structure of the small pelagics. In the last chapter, an epizootic disease was considered. An all-embracing approach directed towards the all-year round detection of both general and specific parasites, bacteria and viruses revealed the mostly temporal and not necessarily high occurrence of only three groups: microparasites, Vibrio spp. (sometimes determined as Vibrio alginolyticus) and bacteria of the genus Tenacibaculum. Although we could not exclude their pathogenicity, significant tissue damage at a cellular or macroscopic level was never observed, making the disease hypothesis less likely. Thus, we considered several hypotheses and indicated that top-down control (through Bluefin tuna predation), pathogens and fisheries are unlikely to be main drivers. In contrast, some environmental parameters explained a part of the variability in fish condition and landings. After a final discussion on all probable theories we concluded that a bottom-up control, such as especially a planktonic change in quantity and/or quality, might be on the basis of the observed changes. Although this work is a great step towards the understanding of the small pelagic dynamics in the Gulf of Lions, further investigations will still be needed to confirm our main hypothesis and to estimate the potential synergetic effect of other drivers
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Pereira, Tadeu José Faria de Sousa. "Effects of the implementation of the MPAs from the Alentejo coast on local fish communities and on some species with commercial/conservation interest". Doctoral thesis, Universidade de Évora, 2018. http://hdl.handle.net/10174/23431.
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Tendo em conta o seu sucesso, as Áreas Marinhas Protegidas (AMP) têm sido implementadas como ferramenta de gestão de recursos pesqueiros. Contudo, o uso desta ferramenta em portugal é ainda relativamente recente. Tendo em conta esta necessidade, em 2011 foi criado o Parque Marinho do Sudoeste Alentejano e Costa Vicentina, que inclui várias AMPs. Duas destas estão localizadas na costa alentejana do referido parque. A eficiência destas ferramentas depende dum planeamento e gestão adequados. De facto, a dimensão duma AMP tem um papel importante na sua eficácia e no tempo necessário para que alterações nas suas comunidades piscícolas seja evidentes. AMPs de maior dimensão e mais antigas tendem a apresentar maiores densidades e exemplares de maior tamanho. Nesse sentido, o principal objectivo desta tese foi avaliar se a designação de pequenas AMPS podem causar impactos positivos a curto prazo em espécies de interesse comercial, nas suas comunidades piscícolas e nas actividades de pesca local. No caso da AMP da Ilha do Pessegueiro, esta provou ser importante e adequada para proteger algumas espécies de interesse comercial, como moreias, safios e sargos, que encontram na zona refúgio e alimento. As comunidades de peixes locais também foram positivamente impactadas, vendo um aumento significativo na sua abundância e diferenças na sua composição quando comparadas com áreas não protegidas. O efeito mais imediato destas medidas é a perda de área de pesca para a frota pesqueira. No entanto, a deslocalização da frota para áreas próximas resultou num aumento das descargas com o tempo. De um modo geral, este trabalho valida a implementação destas medidas como adequadas e eficazes para a proteção marinha e para a exploração sustentável dos recursos. Confirma também que pequenas AMPs podem ser eficazes a curto prazo. No entanto, uma monitorização contínua dos impactos é indispensável. Assim, é aconselhada a manutenção destas medidas de protecção na costa Alentejana; Summary:
Effects of the implementation of the MPAs from the Alentejo Coast on local fish communities and on some species with commercial/conservation interest.
Given their success, MPAs have been widely implemented as fisheries management tools. However, the use of MPAs as conservation and management tools in Portugal is recent. In 2011, the Costa Vicentina and Sudoeste Alentejano (PNSACV) Marine Park was implemented which included several no take MPAs. Two of these were in the Alentejo coast of the Park. MPA efficiency depends on adequate planning and an appropriate management. In fact, the size of the MPA plays an important role on how effective it can be, and how fast changes on fish assemblages may occur. Larger and older MPAs tend to present higher densities and larger specimens than younger or smaller MPAs. The main objective of this dissertation was to evaluate if the designation of small no take MPAs can cause positive impacts at a short term on commercially important fish species, local fish communities and local fisheries. The implementation of the Pessegueiro Island no take MPA proved to be important and adequate for protecting commercially important species, such as morays, congers and seabreams, who find in this area optimal feeding and sheltering areas. Local fish assemblages were also positively impacted by the designation of both no take MPAs, with a significant increase in fish abundance and significant differences in their structure between protected and neighbouring areas. The most immediate consequence of these protective measures was the loss of available fishing grounds, but fleet relocation resulted in the increase in fish landings over time. Overall, this work validates the implementation of these measures as adequate and effective protection tools for marine conservation and sustainable resource exploitation. It also confirms that small no take MPAs can be short term effective. However, continuous monitoring is of the uttermost importance to adapt protective measures. Given this, the continuity of the protective measures in place is advised.
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kuo, kun-fang, i 郭坤芳. "The possible impacts of climatic factors on the fish landing fluctuations in the waters of east Taiwan". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/728yvb.
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碩士國立臺灣海洋大學
環境生物與漁業科學學系
103
Abstract The study was tried to investigate the relationship between the climate variability factors and the annual fish landing during the period of 1983 to 2011 in the waters of eastern Taiwan using the Pearson correlation analysis and wavelet analysis. These and environmental factors including climate variability index have the north pacific gyre oscillation (NPGO), Pacific decadal oscillation(PDO), western Pacifci oscillation (WPO), Arctic oscillation (AO), Philippines–Taiwan oscillation (PTO), El Niño–Southern Oscillation (ENSO) and sea surface temperature. The results are as following: 1. The first eleven dominant species larger than 1% of total fishing landing in the east waters of Taiwan were including mackerel(53.96%), Coryphaena hippurus (8.79%), Decapterus maruadsi (6.04%), Trachurus japonicas (4.21%), shark (4.18%), Decapterus kurroide (3.17%), Auxis rochei (2.67%), Trichiurus lepturus (1.99%), Auix thazard (1.68%), Thunnus albacares (1.46%) and Katsuwonus pelamis (1.25%). All above are occupied 89.41% of total fishing landing in this water. Among them, it showed an increase trend for these species of Decapterus maruadsi, Trachurus japonicus, mackerel, Auxis rochei, shark, Thunnus albacares, Trichiurus lepturus, and Coryphaena hippurus, while a decrease trend was identified to these species of Decapterus kurroides, Katsuwonus pelamis and Auix thazard. 2. The relationship of fishing landing and climate variability index was varied by species. The landing of Trachurus japonicus and Auxis thazard are related to the PDO index, while Decapterus maruadsi, Trachurus japonicas and Thunnus albacares are related significantly in NPGO. In addition, AO and Niño3.4 index may affect the variation of Decanters kurroides and Shark, while SOI and WPO may significantly affect the landing of Thunnus albacores and Decapterus kurroides, respectively. Otherwise, the local sea surface temperature was suggested as a good indicator for evaluating the long-term trend for species of Decapterus maruadsi, Trachurus japonicas, mackerel, Auxis rochei, Thunnus albacares and Shark. 3. The Wavelet analysis shows the periodicity of multiple time scales was different by climatic indices. For PDO index, the periodicity is including the cycle of 9.2 and 5.1 year. For both of WPO and Niño 3.4, they have similar cycles of 5.7 year and 3.5~3.8 year. There are more complicated periodicity more than 3 cycles for SOI, PTO and AO indices, while there is simplify of one periodicity 10.6 year for NPGO, the longest. These periodicity characteristics of climate variability indices to fish landing was varied by species and discussed in this study. Key words：East waters of Taiwan, Climate variability, fish landing, mackerel
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Builder, Tonya L. "Feasibility of supplementary sampling of the commercial groundfish landings in Oregon using seafood plant workers". Thesis, 2000. http://hdl.handle.net/1957/28468.
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Fishery dependent data--length distributions, sex ratios, maturity schedules, and
species composition of landed catches--are necessary for stock assessments.
These data are currently collected by state port biologists using a sampling design
that randomly selects samples from a small percentage of a very large target
population. Sampling programs may need to increase the sample size and
possibly expand data collection times into evenings and weekends. This must
also be accomplished in an economically reasonable manner, which is a
significant challenge. Working cooperatively with the seafood processing plants is
one way to meet these challenges.
This study explored the feasibility of implementing a cooperative sampling program
for Pacific West Coast groundfish, with the goal of improving the precision and
accuracy of estimates derived from the fishery dependent samples. The study
was a cooperative project utilizing seafood processing plant workers to collect fish
length frequency data. There is evidence that the seafood plant workers can
measure fish with reasonable accuracy. This cooperative effort has the potential
to dramatically increase the sample size and the coverage of sampled catch
landings.Graduation date: 2001
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Huang, Yu-Hsiu, i 黃毓琇. "The fluctuation of fish landings possibly influenced by climatic factors in the waters around Taiwan". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/79188586548569029291.
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碩士國立臺灣海洋大學
環境生物與漁業科學學系
102
In this study, we analyzed thefishery data (1993-2011) from Fisheries yearbook-Taiwan area during 1993 to 2011 around water of Taiwan to investigate the influences of climatic indices(PDO, WPO, NPGO, SOI and Nino 3.4) and sea surface temperature. In the absence of reliable fishing effort data, can not estimate the advantages of fish catch per unit effor, or landing per unit effort amounts of data. A wavelet analysis and Pearson correlation analysis revealed that variations in climatic indices might have affected the abundance and composition of commercial fish species. The results of thisstudyare as follows: 1. The annual trends of the total catches on the waters around Taiwan showed the decreased trends, Mackerel, Jack mackerel, Auxis rochei.The commercial fish species showed the decreasing trends including Inshore squids, Golden trivially, White croaker, japanese butterfish, pomfret white, Red bigeye fish, Spanish Mackerel, Buccaneer anchovy, Black Pompano , Redeye round herring , Korean mackerel , mullet , Silver anchovy, etc. 2. The trophic level (TL) in the range of 2 to 4, also showed a decreasing trend,especiallythe species of TL less than 3 (mullet, black pomfret and Silver anchovy) 3. The WPO was not statistically significant with 26 commercial fish species. The significant association of 12, 16 and 14 fish species with the annual PDO, NPGO and ENSO showed a periodicity of multiple time scales, respectively. 4. And sea surface temperature showed a positive correlation of species are: Inshore squids, Common dolphinfish, Round scad, Auxis rochei, Buccaneer anchovy, Korean mackerel , Silver anchovy, etc.. Negatively related species are: White croaker, japanese butterfish, orbfish orbis, Red bigeye fish, Spanish Mackerel, Boarfish, Brown croaker, Triggerfish, Black Pompano , Korean mackerel, mullet, etc. Keywords: around water of Taiwan, climatic indics, Trophic level, Sea surface temperature
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Besugo, Ana Isabel Canelas Pinto. "Caracterização da pescaria do peixe-espada preto nos Açores de 2008 a 2012". Master's thesis, 2014. http://hdl.handle.net/10400.3/2898.
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Dissertação de Mestrado, Estudos Integrados dos Oceanos, 13 de Fevereiro de 2014, Universidade dos Açores.Desde 1998 que a pesca do peixe-espada preto nos Açores tem vindo a ter uma importância crescente, como resultado da procura de novos recursos e dos bons resultados obtidos pelas experiências de pesca exploratórias levadas a cabo pela frota Madeirense na região. Actualmente a pescaria açoriana é caracterizada por uma actividade irregular cuja frota é composta por embarcações palangreiras cabinadas e de dimensão média. A área de actuação da frota compreende as áreas circundantes às ilhas de registo de cada embarcação mas um maior esforço de pesca é observado na região adjacente às ilhas do grupo central. A variação dos rendimentos anuais em peso parece indicar uma estabilidade dos índices de abundância de peixe-espada preto na região. As quantidades de espécies acessórias descarregadas variaram entre os 5% (2010) e os 12% (2012) das capturas totais em peso e a sua composição específica foi essencialmente composta por “tubarões de profundidade”. Até à data a gestão desta pescaria tem considerado apenas a captura de uma espécie, Aphanopus carbo. Contudo, estudos recentes demonstraram que existem duas espécies (A. carbo e A. intermedius) que vivem em simpatria na região dos Açores. Neste contexto, com base em metodologias genéticas, foram estimadas as proporções relativas das duas espécies nos desembarques realizados em 2012 e 2013. As estimativas realizadas para 2012 indicam que se capturaram aproximadamente 106 ton de A. carbo e 351 ton de A. intermedius nos Açores. Sendo o TAC nacional (Áreas ICES VIII, IX e X) de cerca de 3311 ton/ano (6622 ton para 2012 e 2013) a manter-se os atuais níveis de captura de A. carbo nos Açores (106 ton) e no Continente (2668 ton) não é expectável que o TAC seja ultrapassado devido às quantidades capturadas pela frota açoriana.
ABSTRACT: Since 1998, the black scabbard fish fishery in Azores has become increasingly important as a result of the demand for new resources exploitation and the good results obtained by the exploratory fishing experiments carried out by the Madeira fleet in the region. Nowadays, the Azorean fleet is characterized by an irregular activity that comprised mid-size long line vessels operating around the islands but a greater fishing effort is observed in the region adjacent to the islands of the central group. The LPUE indicate the stability of the abundance indices of black scabbard fish in the region. The amounts of by-catch ranged from 5 % (2010) to 12 % (2012) of the total catch in weight and its composition is essentially composed by "deep sea sharks". To date the management of this fishery has considered only the capture of one species of black scabbard fish, Aphanopus carbo. However, recent studies have shown that there are two species (A. carbo and A. intermedius) living sympatrically in the Azorean region. In this context, based on genetic methodologies, the estimated relative proportions of the two species in 2012 and 2013 landings were estimated. For 2012, the estimations indicated that about 106 tons of A. carbo and 351 ton of A. intermedius in the Azores were captured. Being the national TAC ( ICES Areas VIII , IX and X ) of about 3311 ton/year (6622 ton for 2012 and 2013) to keep the current catch levels of A. carbo in Azores (106 ton) and in the Mainland (2668 ton) is not expected that the TAC is exceeded due to the quantities caught by Azorean fleet.
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Lung-Hua, Yen, i 顏隆華. "Study on the diversity and dominant species of trash fish from the landings of bull trawlers operated in the waters off Lin-Yuan, southwestern Taiwan". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/12407338076027198690.
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碩士國立高雄海洋科技大學
漁業生產與管理研究所
97
The diversity and dominant of trash fish species of bull trawlers operated at the night in the waters off Lin-Yuan, southwestern Taiwan were examined based on the species composition of samples taken from October 2006 to September 2007. In total, 62 species from 28 families and 42 genera were obtained for fish; 6 species from 6 families and 6 genera were for crustacean; 5 species from 4 families and 4 genera were for cephalopods. The myctophids (Benthosema pterotum) was the most dominant species. There was no significant difference at species composition of trash fish for different lunar phase. The multivariate analyses based on the cluster and nonparametric multi-dimensional scaling could identify two groups roughly corresponding to “spring-summer” and “fall-winter” seasons. Species dominance was higher for fall and winter, but was lower for spring to summer. Species diversity was higher for spring and summer, but was lower for fall to winter.
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Lange, Bålman Miriam. "GRAVIDA KVINNORS INTAG AV KOSTTILLSKOTT : En kvantitativ studie med fokus på järn och probiotika". Thesis, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-157637.
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Sammanfattning Bakgrund Vitamin- och mineralbrister hos gravida kvinnor kan leda till missfall och allvarliga störningar i barnets utveckling. Moderns tarmflora överförs med stor sannolikhet till barnet under förlossningen och kan därför innebära ett viktigt steg i utvecklingen av barnets tarmflora. En tänkbar lösning för att säkra ett adekvat intag kan vara konsumtion av kosttillskott och probiotika. I dagsläget finns osäkra uppgifter om hur många gravida kvinnor som intar tillskott. Syfte Att undersöka hur många gravida kvinnor i Västerbottens län som valde att inta kosttillskott, främst järn och probiotika, samt om det fanns en skillnad mellan olika faktorer och intag. Metod En kvantitativ tvärsnittsstudie där gravida kvinnor (n=1473) från Northpop-studien i Västerbottens län svarade på ett frågeformulär gällande intag av kosttillskott och faktorer som ålder, utbildning, kostregim etc. De statistiska tester som användes var Chi-2-test, oberoende t-test och Mann Whitney U-test. Materialet analyserades i SPSS. Signifikansnivån sattes till p<0,05. Resultat Majoriteten av deltagarna svarade att de intog kosttillskott. Faktorer som ökade intaget av kosttillskott hos gravida kvinnor var högre ålder (p=0,030) jämfört med lägre ålder, högre utbildningsnivå (p=0,006) jämfört med lägre utbildningsnivå och vegetarisk/vegansk kost (p=0,021) jämfört med blandkost. Femtiofem procent uppgav att de intog järntillskott. De faktorer som ökade intaget av järntillskott hos gravida kvinnor var vegetarisk/vegansk kost (p=0,001) jämfört med blandkost. Probiotika intogs av 2 procent. Ett högre intag av probiotika sågs hos personer boende i stadsområde (p=0,024) jämfört med övriga boenderegioner samt de som åt vegetarisk/vegansk kost (p=0,001) jämfört med blandkost. Slutsats Majoriteten av deltagarna intog någon typ av kosttillskott, hälften intog järntillskott och en liten andel intog probiotika. Lågutbildade, yngre, de som äter blandkost och bor utanför stadsområde verkar vara i riskgruppen för att inte inta kosttillskott.Abstract Background Vitamin and mineral deficiencies in pregnant women can lead to miscarriage and serious disturbances in children’s development. The intestinal flora of the mother is most likely transmitted to the child during childbirth and may lay the foundation for the child's health. One possible solution to ensure an adequate intake may be the consumption of dietary supplements and probiotics. At present, there is insufficient data on supplement consumption among pregnant women. Objective The purpose of the study was to examine how many pregnant women in Västerbotten County chose to consume dietary supplements, mainly iron and probiotics, and whether there was a difference between different factors and intake. Method A quantitative cross-sectional study where pregnant women (n=1473) from the Northpop-study in Västerbotten County responded to a questionnaire regarding consumption of dietary supplements and factors such as age, education, diet etc. The material was analyzed in SPSS with Chi-2-test, independent T-Test and Mann-Whitney U-Test. Using significance level <0.05. Results The majority of participants, 90 percent, responded that they consumed dietary supplements. The factors that increased the intake of dietary supplements in pregnant women were higher age (p=0.030), higher education (p=0.006) and vegetarian/vegan diet (p=0.021). Iron was reported to be consumed by 804 people, 55 percent. The factors that increased the intake of iron supplement in pregnant women were vegetarian/vegan diet (p=0.001). Probiotics were consumed by 25 people, 2 percent. Living in urban areas (p=0.024) and eating vegetarian/vegan diet (p=0.002) increased consumption of probiotics. Conclusion The majority of participants chose to consume some type of dietary supplement, half of the participants consumed iron supplements and a small part consumed probiotics. It appears that pregnant women who are low educated, younger, eating an omnivorous diet and living outside urban areas are in the risk zone for not consuming dietary supplements.
Northpop
Książki na temat "Fish landing"
1
Pizzali, A. F. Medina. Small-scale fish landing and marketing facilities. Rome: Food and Agriculture Organization of the United Nations, 1988.
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Fish on!: A guide to playing and landing big fish on a fly. Lanham, Md: Derrydale Press, 2003.
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Diei-Ouadi, Yvette. Minced sardinella fillets in fish-landing and marketing sites in Senegal. Rome: Food and Agriculture Organization of the United Nations, 2005.
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Authority, Sea Fish Industry. Seafish technology: Preliminary guidelines for the facilities and equipment landing required for handling fish during its storage, auction and dispatch from the landing area. [UK]: Sea Fish Industry Authority, 1992.
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Latanowicz, Jerzy. Analysis of the fish landing complex activities and future commercial viability against the background of the fish marketing system in the Bahamas: A report prepared for the fisheries development project (Phase II). Rome: Food and Agriculture Organization, 1985.
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Latanowicz, Jerzy. Analysis of the fish landing complex activities and future commercial viability against the background of the fishmarketing system in the Bahamas: A report. Rome: Food and Agriculture Organization, 1985.
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Johns, M. A. Trends in Texas commercial fishery landings, 1972-1989. Austin, Tex. (4200 Smith School Rd., Austin 78744): Texas Parks and Wildlife Dept., Fisheries Division, Coastal Fisheries Branch, 1990.
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Robinson, Lance. Trends in Texas commercial fishery landings, 1972-1998. Austin, Tex: Texas Parks & Wildlife, Coastal Fisheries Division, 2000.
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King, M. R. Fish and shellfish landings by domestic fishermen, 1974-82. [Wellington]: New Zealand Ministry of Agriculture and Fisheries, 1985.
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Ministry of Agriculture, Fisheries and Food. Statistics of fish landings in England, Wales and Northern Ireland by port. London: MAFF, 1996.
Znajdź pełny tekst źródłaCzęści książek na temat "Fish landing"
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Marçalo, Ana, Mike Breen, Maria Tenningen, Iñigo Onandia, Luis Arregi i Jorge M. S. Gonçalves. "Mitigating Slipping-Related Mortality from Purse Seine Fisheries for Small Pelagic Fish: Case Studies from European Atlantic Waters". W The European Landing Obligation, 297–318. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03308-8_15.
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Jha, Amrita, Biswakalyani Panda i J. D. Agrawal. "Study on Wave Transformation and Tranquillity Studies for the Development of Fish Landing Facility at Ajanur, Kasargod, Kerala". W River and Coastal Engineering, 377–88. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-05057-2_32.
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Martín, Paloma, Nixon Bahamon, Ana Sabatés, Francesc Maynou, Pilar Sánchez i Montserrat Demestre. "European anchovy (Engraulis encrasicolus) landings and environmental conditions on the Catalan Coast (NW Mediterranean) during 2000–2005". W Essential Fish Habitat Mapping in the Mediterranean, 185–99. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-9141-4_14.
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"Land Follows Fish". W Landing Native Fisheries, 35–59. University of British Columbia Press, 2009. http://dx.doi.org/10.59962/9780774856102-005.
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"Exclusive Fisheries and the Public Right to Fish". W Landing Native Fisheries, 78–91. University of British Columbia Press, 2009. http://dx.doi.org/10.59962/9780774856102-007.
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"The Angler in the Environment: Social, Economic, Biological, and Ethical Dimensions". W The Angler in the Environment: Social, Economic, Biological, and Ethical Dimensions, redaktorzy Eric N. Powell, Eleanor A. Bochenek, John DePersenaire i Sarah E. King. American Fisheries Society, 2011. http://dx.doi.org/10.47886/9781934874240.ch10.
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<i>Abstract</i> .—Summer flounder <i>Paralichthys dentatus </i> supports an important recreational fishery along the northeastern coast of the United States. Successful rebuilding of the stock and the need to constrain landings within total-allowable-landing targets has resulted in declining bag limits, increasing size limits, higher discarding, and a reduction in satisfaction derived from recreational fishing trips. A series of fishing trips were observed in which alternative regulatory scenarios were tested to identify approaches to better optimize bag limits and size limits. The alternatives included a slot limit in which some smaller fish were allowed to be landed, a reduced minimum size, and a cumulative size, in which the bag limit and size limit were conflated such that fish take was controlled by the cumulative size of the landed fish. Comparisons were made to fishing trips conducted under 2006 regulations that produced higher injury frequencies than other regulatory scenarios due to discarding of larger fish that tended to be gut-hooked. Two alternatives performed significantly better in terms of reducing the potential for discard mortality among discarded fish, the slot-limit and the cumulative-size scenarios. An intermediate performance of the reduced-minimum-size scenario was due to an increased proportion of dead fish, but this association was unexplained. Fish uninjured save for minor hook damage were common on all vessels and in all fishing approaches. Injury frequency was, in fact, remarkably low, less than half of the assumed discard mortality rate in presentday stock assessments. The study supports the use of size-specific mortality rates for fish discarded recreationally. The study offers no support for the efficacy of the 2006 regulatory system in controlling discard mortality rate. Any of the alternative plans is an improvement, but the slot-limit and cumulative-size scenarios are deserving of the most scrutiny.
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"4. Fish Landings". W Artisanal Fishers on the Kenyan Coast, 55–70. BRILL, 2009. http://dx.doi.org/10.1163/ej.9789004178083.i-148.31.
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"Biology and Management of Dogfish Sharks". W Biology and Management of Dogfish Sharks, redaktorzy Jackie R. King i Gordon A. McFarlane. American Fisheries Society, 2009. http://dx.doi.org/10.47886/9781934874073.ch8.
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Abstract.—Spiny dogfish <em>Squalus acanthias </em>have been an important component of the Strait of Georgia fisheries from the late 1800s to the late 1940s, when the fishery collapsed owing to overfishing and changes in market demand. The stock population levels have sustained a commercial fishery of approximately 2,000 metric tons since 1978. Recent concerns regarding the status of dogfish stocks worldwide have reprioritized the status assessment of dogfish in British Columbia. Longline research surveys were conducted for dogfish in the Strait of Georgia in 1986, 1989, and 2005. Additional sources of information are catch and effort data collected through logbook records from the commercial longline fishery. Recent improvements in gear configuration resulted in a switch in the mid-1990s from traditional J hooks to circle hooks, which makes direct comparison of catch rates difficult. In November 2004 a calibration experiment using J hooks and circle hooks demonstrated that, overall, spiny dogfish catch per unit effort (CPUE) for circle-hook gear was 1.6–1.7 times higher than that for J-hook gear. After applying this conversion to the commercial longline CPUE data available for 1980–1984 and 2000–2004, no significant trend in catch rate over time was detected. The catch rate observed in the longline research survey actually increased in 2005 compared to 1986 and 1989. In both fisheries and research data, the proportion of smaller spiny dogfish in the size distribution has increased, reducing the overall mean size. The decline in mean size is probably due to an increase in recruitment of juvenile fish. However, caution in management of this stock is warranted given that the current commercial fishery is now landing a large proportion (estimated 80%) of immature fish. Increased fishing pressure on juveniles could have implications for the abundance of mature fish in upcoming decades.
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"FISH LANDINGS, FIRST SALES AND PROCESSING". W World Fisheries Resources, 227–47. Routledge, 2002. http://dx.doi.org/10.4324/9780203417324-15.
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"Red Snapper: Ecology and Fisheries in the U.S. Gulf of Mexico". W Red Snapper: Ecology and Fisheries in the U.S. Gulf of Mexico, redaktorzy ROBERT J. ALLMAN i GARY R. FITZHUGH. American Fisheries Society, 2007. http://dx.doi.org/10.47886/9781888569971.ch21.
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<em>Abstract.</em>—Red snapper <em>Lutjanus campechanus </em>sagittal otoliths were sampled from U.S. Gulf of Mexico commercial vertical hook and line, longline and recreational landings over a twelve year period (1991–2002). Our objectives were to examine the empirical age structure of red snapper through space and time, to gauge the relative year-class strength over time, and to compare the impact of strong year-classes upon annual age structure by fishing sector. The recreational fishery selected the youngest fish with a mode at 3 years and a mean age of 3.2 years. The commercial vertical hook and line fishery selected for slightly older fish with a mode of 3 years and a mean age of 4.1 years. The commercial longline fishery selected the oldest individuals with fish first fully recruited to the fishery by age 5 and, a mean age of 7.8 years. Only the commercial longline fishery age distributions were significantly different between the eastern and western Gulf of Mexico. Based on age progressions, strong 1989 and 1995 year-classes were dominant in the landings of the recreational and commercial vertical hook and line fisheries and the 1995 year-class was dominant in the commercial longline landings. A relative year-class index further highlighted these results, and we noted a significant correlation in year-class strength between recreational and commercial vertical hook and line sectors. The year-class index for combined sectors was also significantly correlated between eastern and western Gulf of Mexico with 1989 and 1995 year-classes similarly dominating both regions. An empirical age progression year-class index could be valuable in correlation with early life abundance indices of red snapper and serve to provide inference about the relative error of recruitment data.
Streszczenia konferencji na temat "Fish landing"
1
Amri, Asbahrul, Bakruddin Anhar i Muhammad Ramaditya. "Identification of Market Operator and Marketing Channels in Fish Landing Center (A Case Study Lhok Pawoh Fish Landing Center)". W 6th Annual International Conference on Management Research (AICMaR 2019). Paris, France: Atlantis Press, 2020. http://dx.doi.org/10.2991/aebmr.k.200331.049.
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Bandyopadhyay, Promode R. "Flying Fish Sculls to Taxi and Perturbs Wing Lift With Travelling Waves to Land". W ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7507.
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The top 200 meters of oceans abound in life forms since photosynthesis is possible in that layer. Competition and predator-prey (swordfish-flying fish, 102–104 to 1 mass ratio) interactions are intense here. Chased by predators, a flying fish (FF) — a pleuston — frantically escapes from the water and becomes airborne. Here we report the visual observations of oceanic surface and body distortions of FF to surmise the mechanisms of propulsion during taxiing and landing. FF leaps, not when it is chased, but when the additional energy required for further increase in speed underwater exceeds that required to leap.1 The higher metabolic cost of transport of regular flapping flight in air than in water is circumvented by gliding. We examine the BBCTV video2 by Richard Attenborough, the noted naturalist. An FF may camber its wings like parafoils and may also twist the outer half of the wings during taxiing and climbing. To produce thrust during taxiing, the FF sculls with the lower lobe of the tail fin to produce a reverse Karman vortex jet; there is rapid flicking of the lower lobe of the tail fin tangentially over the surface. The body acts as a chaotic damped and driven pendulum to produce the high-velocity wide flick. To damp after takeoff, it becomes a single asymmetric pendulum. Unpowered (foil) gliding follows. For descent, the wings are shaped, untwisted parafoils and, just prior to touchdown, travelling waves are superimposed, producing, in contrast to taxiing, an impressively smooth small-angle-of-attack tail touchdown on water without any nose-down. The spiked crowns of Richtmyer-Meshkov interface instability are visible on the ocean surface during leaping but not during landing. Trailing hydraulic jumps are observable during landing but not during leaping. The leap is a high-acceleration and Weber number dominated (inertia/capillary forces) phenomenon, but the landing involves little impact force and is dominated by Froude number forces (inertia/gravity forces). The evidence suggests that, prior to leaping and while still underwater, the FF reads the surface wind direction to align the flight path.
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Inomata, S. O., i C. E. C. Freitas. "Fish landings in Barcelos, in the Middle Negro River Region, Amazonas". W ECOSUD 2015. Southampton, UK: WIT Press, 2015. http://dx.doi.org/10.2495/eco150071.
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