Relevant bibliographies by topics / Abalone fisheries

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters

Academic literature on the topic 'Abalone fisheries'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 July 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Abalone fisheries.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Abalone fisheries"

1

Sembiring, Sari Budi Moria, Ida Komang Wardana, and Ketut Sugama. "PEMBESARAN JUVENIL TERIPANG PASIR, Holothuria scabra DAN BENIH ABALON, Haliotis squamata DALAM SISTEM POLIKULTUR." Jurnal Riset Akuakultur 13, no. 1 (March 1, 2018): 21. http://dx.doi.org/10.15578/jra.13.1.2018.21-28.

Full text
Abstract:
Tujuan penelitian adalah menguji efisiensi pembesaran juvenil teripang pasir, Holothuria scabra dan benih abalon, Haliotis squamata pada sistem polikultur. Penelitian dilakukan di Balai Besar Riset Budidaya Laut dan Penyuluhan Perikanan Gondol. Wadah percobaan berupa bak fiber volume 1 m3, abalone dipelihara dalam keranjang plastik ukuran 45 cm x 45 cm x 25 cm sebanyak dua buah/bak, sedangkan teripang dipelihara di dasar bak dengan sistem air mengalir. Kepadatan abalon 50 ind./keranjang dan teripang 100 ind./bak. Ukuran panjang dan bobot juvenil teripang yang digunakan adalah 3,17 ± 0,77 cm; 1,74 ± 0,64 g; dan benih abalone 3,16 ± 0,48 cm dan 4,82 ± 0,87 g. Jenis pakan abalon berupa rumput laut Gracilaria sp. dan Ulva sp. sedangkan teripang diberi pakan berupa bentos selama enam bulan pemeliharaan. Sebagai perlakuan adalah pemeliharaan teripang dan abalon: A (tanpa pemberian bentos), B (ditambah bentos), dan C (ditambah bentos dan tanpa abalon), masing-masing perlakuan diulang tiga kali. Parameter yang diamati meliputi pertumbuhan, sintasan, kualitas air, dan kandungan proksimat feses abalon. Hasil menunjukkan bahwa pertumbuhan juvenil teripang pasir berbeda nyata (P<0,05); rata-rata panjang total dan bobot badan pada perlakuan B lebih tinggi (4,45 ± 1,06 cm; 8,06 ± 1,19 g) dibandingkan dengan perlakuan lainnya. Sebaliknya sintasan juvenil teripang pasir tidak berbeda nyata antar perlakuan (P>0,05). Pertumbuhan bobot benih abalon berbeda nyata antar perlakuan (P<0,05) dengan nilai rata-rata pada perlakuan A (16,75 ± 2,96 g) dan B (12,77 ± 2,69 g). Sedangkan pertumbuhan panjang cangkang dan sintasan tidak berbeda nyata (P>0,05). Produktivitas polikutur pada perlakuan A mencapai 208,54 g untuk teripang dan 4.656 g untuk abalon; diikuti perlakuan B mencapai 118,55 g untuk teripang dan 3.493 g untuk abalon dan perlakuan C sebesar 34,50 g.The aim of the research was to examine the grow-out efficiency of sea cucumber, Holothuria scabra, and abalone, Haliotis squamata fry in a polyculture system. The research was conducted in the Institute for Mariculture Research and Fisheries Extension, Gondol. Containers used in this research were nine fiberglass tanks each with a volume of 1 m3. The abalone fry were reared in two baskets sized 45 cm x 45 cm x 25 cm while sea cucumber fry were reared on the bottom of the tank and. Water exchange used a flow-through system. The density of abalone was 50 fry/basket and sea cucumber was 100 fries/tank. The averages of length and body weight of sea cucumber were 3.17 ± 0.77 cm and 1.74 ± 0.64 g, respectively. The abalone fry had the averages of length and body weight of 3.16 ± 0.48 cm and 4.82 ± 0.87 g, respectively. Feeds used for the abalone fry were Gracilaria sp. and Ulva sp. while for sea cucumber was benthos. These feeds were used during the six months of the research. Treatments were grow-out of sea cucumber and abalone: A (without benthos), B (with benthos), and C (with benthos but without abalone), each treatment had three replicates. Parameters measured were growth and survival rate, water quality, and proximate analysis of abalone feces. The results showed that the growth of sea cucumber was significantly different (P<0.05), mean of total length and body weight of treatment B was higher (4.45 ± 1.06 cm; 8.06 ± 1.19 g) compared to the two other treatments. On the other hand, the survival rate of sea cucumber fry was not significantly different among treatments (P>0.05). The growth of body weight of abalone was significantly different (P<0.05) among the treatments in which the average for treatment A was 16.75 ± 2.96 g and treatment B was 12.77 ± 2.69 g. The growth of carapace length and survival rate were not significantly different (P>0.05). The productivity of polyculture in treatment A reached 208.54 g for sea cucumber and 4,656 g for abalone; followed by treatment B of 118.55 g for sea cucumber and 3,493 g for abalone and treatment of C 34.50 g.
APA, Harvard, Vancouver, ISO, and other styles
2

McShane, PE. "Recruitment variation in abalone: Its importance to fisheries management." Marine and Freshwater Research 46, no. 3 (1995): 555. http://dx.doi.org/10.1071/mf9950555.

Full text
Abstract:
Recruitment failure has been implicated in the decline of several abalone fisheries. Traditionally, fisheries scientists invoke theoretical stock-recruitment relationships to predict trends in abundance of an exploited stock under various harvest regimes. The empirical evidence in support of a positive relationship between spawning stock and recruits is not strong. A further problem in interpretation of such relationships is that both 'stock' and 'recruitment' have various definitions in fisheries and ecological literature. The definition of a stock for abalone is not clear. As emphasized in this review, which considers each stage in the life history of abalone, the abundance of spawners is one of many sources of variation in recruitment. The evidence for invertebrates, particularly those with high fecundity, is that recruitment varies independently of the abundance of spawners. This is also the case for abalone, where recruits have been measured as the density of immediate post-settlement individuals, juveniles, or as adults entering the exploitable stock. A problem with stock-recruitment hypotheses is that they have intuitive appeal. It is considered 'dangerous' to manage fisheries under the assumption that a reduction in the number of spawners by fishing will not affect recruitment. Such danger to abalone stocks has been more recently assessed by egg-per-recruit analyses, whereby various harvest strategies are examined relative to reference points for egg production. These studies are reviewed and assessed relative to the often conflicting aims of managers and scientists. This review of studies of recruitment variation in abalone emphasizes the need for a more rigorous, autecological approach to stock assessment in which field experiments are conducted over realistic spatial and temporal scales, permitting robust testing of hypotheses.
APA, Harvard, Vancouver, ISO, and other styles
3

Shepherd, S. A., and L. D. Brown. "What is an Abalone Stock: Implications for the Role of Refugia in Conservation." Canadian Journal of Fisheries and Aquatic Sciences 50, no. 9 (September 1, 1993): 2001–9. http://dx.doi.org/10.1139/f93-224.

Full text
Abstract:
This paper concerns the conservation of abalone stocks in a genetic and fisheries sense. We review genetic and ecological information relating to the differentiation of abalone stocks in South Australia and propose that metapopulation theory provides an apt framework in which to develop the concept of an abalone stock. We consider what is a minimum viable population for abalone and illustrate our discussion with a case study of an abalone population that declined through a combination of fishing, recruitment failure, and inadequate protection by a refugium. Refugia can play an important role in abalone conservation by maintaining egg production and genetic diversity and by preserving populations for scientific study.
APA, Harvard, Vancouver, ISO, and other styles
4

Dang, Cecile, and Terrence L. Miller. "Disease threats to wild and cultured abalone in Australia." Microbiology Australia 37, no. 3 (2016): 137. http://dx.doi.org/10.1071/ma16047.

Full text
Abstract:
Abalone species are important for recreational and commercial fisheries and aquaculture in many jurisdictions in Australia. Clinical infections with viral, bacterial and parasitic pathogens can cause significant losses of wild and cultured stock, and subclinical infections may result in decreased productivity and growth. Infections with abalone herpesviruses (AbHV), Vibrio spp. and parasites of the genus Perkinsus are of particular concern to Australian fisheries. Here we provide a brief overview of these three major pathogen groups and their diagnoses from an Australian perspective.
APA, Harvard, Vancouver, ISO, and other styles
5

Stirn, J., and K. A. AI-Hashmi. "Contributions to the knowledge of the Biology of the Arabian Abalone Haliotis mariae Wood, 1828." Journal of Agricultural and Marine Sciences [JAMS] 1 (January 1, 1996): 33. http://dx.doi.org/10.24200/jams.vol1iss0pp33-40.

Full text
Abstract:
The Arabian abalone occur in the Arabian Sea’s rocky coastal zone in association with conspicuous macrolgal communities in which it represents the dominant herbivorous component. Despite such ecological importance and although the commercial exploitation of abalone presents a considerable contribution to Omani fisheries, almost nothing is known about the biology of this species. This report presents results of research carried out in the field and with laboratory cultures, and draws general conclusions related also to the fisheries management of these possibly overexploited abalone populations, Cobort observations in the field and measured increments of cultured specimens showed a growth rate significantly higher than in other abalone species, i.e. greater than 3 mm shell-increment per month. The very early sexual maturity demonstrated by captivity spawnings of approximately one year old animals is also quite unusual. The ejected eggs formed mucous mono layers attached to the substratum whereas other abalone species produce pelagic eggs. Jvenile coborts in nature and the periodic spawning of cultured animals indicate the major spawning in spring and postmonsoon one in autumn. The models previously applied in fisheries management of abalone in Oman assumed only one spawning per year, the first being at age 2+, and a slower growth-rate. These models should be reconsidered using the new data, which may partially explain why abalone are less overexploited than one would expect looking at heavy harvesting. In view of a projected commercial abalone cultivation our laboratory rearing experiments showed that both natural and/or artificial food may be used, provided this contains-apart from standard ingredients, the seaweed-borne components (probably phycobillins) required for a normal parasite , resistant shell formation. With regard to artificial reproduction, our preliminary trials showed that spawning , fertilization ,and initial larval rearing present no problems. The steps from the pediveliger to larval settlement, however ,seem to be fatally exposed to eilitate attacks. Further research is needed in order to eliminate this critical problem.
APA, Harvard, Vancouver, ISO, and other styles
6

Straus, Kristina M., and Carolyn S. Friedman. "Restoration aquaculture of the pinto abalone (Haliotis kamtschatkana kamtschatkana Jonas): impacts of rearing method on behaviour, growth and survivorship in the hatchery." Marine and Freshwater Research 60, no. 10 (2009): 1021. http://dx.doi.org/10.1071/mf08262.

Full text
Abstract:
Pinto abalone (Haliotis kamtschatkana kamtschatkana) populations in Washington State (USA) and British Columbia (Canada) continue to decline despite fisheries closures. For successful recovery, supplementation may be necessary. To determine appropriate culture methods, juveniles were reared in habitat-enriched tanks (supplemented with rocks, macroalgae and sea urchins) or conventional aquaculture tanks and assessed for growth and survivorship in the laboratory over 15 months. No differences in survivorship or growth were observed. Subsequent experiments examined whether abalone behaviour (habitat selection and movement patterns) differed between rearing treatments. Abalone were exposed to one of three predator treatments (sea star arm, small crab, or no predator (control)) and filmed for 8 h. Abalone from habitat-enriched tanks changed habitats significantly more often than abalone from conventional tanks regardless of predator treatment. Significant differences in the percentage of time that abalone occupied the various habitats were also observed. Abalone in the sea star and control treatments primarily occupied the rocks, whereas abalone in the crab treatment behaved differently depending on the rearing method; conventionally reared abalone spent more time in corners, whereas abalone from habitat-enriched tanks spent more time exposed. These results demonstrate that rearing conditions can affect abalone behaviour and should be considered for abalone restoration efforts worldwide.
APA, Harvard, Vancouver, ISO, and other styles
7

Kim, Jihoon, Akira Nakayasu, and Naruhito Takenouchi. "Socio-economic analysis on the role of local government in developing the abalone industry in Korea." Research in Agriculture Livestock and Fisheries 3, no. 2 (August 19, 2016): 345–53. http://dx.doi.org/10.3329/ralf.v3i2.29365.

Full text
Abstract:
Many Koreans regard abalone (Haliotus discus hannai) as a desirable luxury food because of its limited availability and high price. Abalone aquaculture was developed during the late 2000s, and production has greatly increased in Korea, reaching 9,147 tons in 2014. Policy experts said this trend means many fishers who cultivate abalone could increase their income. However, their incomes had not increased since fishers started cultivating abalone, because a conventional “addition” was applied to abalone transactions. The distribution structure for abalone products relies almost entirely on wholesalers instead of fisheries cooperatives, which are commonly used for other types of seafood products. Therefore, a new distribution structure was required in the Korean abalone industry. The objective of this study was to document how the establishment of an abalone cooperative by the local government has affected fishers’ income and production since 2009. This research was conducted in Wando District in South Jeolla Province, which accounts for over 90% of the domestic abalone production. Wholesalers, fishers, and a public officer were interviewed. A shift from a wholesalercontrolled distribution structure to a cooperative run by the local government helped to reduce the “addition” and increase fishers’ incomes overall.Res. Agric., Livest. Fish.3(2): 345-353, August 2016
APA, Harvard, Vancouver, ISO, and other styles
8

Takagi, Motoki, Hayato Mori, Adiljan Yimit, Yoshihiro Hagihara, and Tasuku Miyoshi. "Development of a Small Size Underwater Robot for Observing Fisheries Resources – Underwater Robot for Assisting Abalone Fishing –." Journal of Robotics and Mechatronics 28, no. 3 (June 17, 2016): 397–403. http://dx.doi.org/10.20965/jrm.2016.p0397.

Full text
Abstract:
[abstFig src='/00280003/16.jpg' width=""155"" text='Overview of a small size underwater robot' ] In abalone fishing with spearing, size of abalone which was allowed to catch is strictly controlled in Japanese law. Therefore, fisherman usually judge size by observing from a boat. However, this is difficult, due to aging. Therefore, we have been developing an underwater robot to assist fisherman in determining abalone size by using a stereo camera. The robot is small size and uses 6 thrusters to achieve 5 DOF motion in an underwater environment.
APA, Harvard, Vancouver, ISO, and other styles
9

Ben-Horin, Tal, Kevin D. Lafferty, Gorka Bidegain, and Hunter S. Lenihan. "Fishing diseased abalone to promote yield and conservation." Philosophical Transactions of the Royal Society B: Biological Sciences 371, no. 1689 (March 5, 2016): 20150211. http://dx.doi.org/10.1098/rstb.2015.0211.

Full text
Abstract:
Past theoretical models suggest fishing disease-impacted stocks can reduce parasite transmission, but this is a good management strategy only when the exploitation required to reduce transmission does not overfish the stock. We applied this concept to a red abalone fishery so impacted by an infectious disease (withering syndrome) that stock densities plummeted and managers closed the fishery. In addition to the non-selective fishing strategy considered by past disease-fishing models, we modelled targeting (culling) infected individuals, which is plausible in red abalone because modern diagnostic tools can determine infection without harming landed abalone and the diagnostic cost is minor relative to the catch value. The non-selective abalone fishing required to eradicate parasites exceeded thresholds for abalone sustainability, but targeting infected abalone allowed the fishery to generate yield and reduce parasite prevalence while maintaining stock densities at or above the densities attainable if the population was closed to fishing. The effect was strong enough that stock and yield increased even when the catch was one-third uninfected abalone. These results could apply to other fisheries as the diagnostic costs decline relative to catch value.
APA, Harvard, Vancouver, ISO, and other styles
10

Mu'minun, Nona, Sutia Budi, and Erni Indrawati. "ANALISIS EKSTRAK ABALON TROPIS HALIOTIS ASININA TERHADAP GAMBARAN REGENERASI LUKA SIRIP KAUDAL IKAN NILA OREOCHROMIS SP." Journal of Aquaculture and Environment 6, no. 2 (June 30, 2024): 73–79. http://dx.doi.org/10.35965/jae.v6i2.3135.

Full text
Abstract:
Penelitian ini bertujuan untuk menganalisis efektivitas ekstrak visceral abalon tropis haliotis asinine dalam percepatan regenerasi luka sirip kaudal ikan nila (Oreochromis) dan menganalisis efektivitas simplisia mucus abalon tropis haliotis asinine dalam percepatan regenerasi luka sirip kaudal ikan nila (Oreochromis). Penelitian ini dilaksananakan di bulan Juli tahun 2023 bertempat di bertempat di Lembaga Pengkajian dan Penerapan Teknologi Sumberdaya Perikanan dan Kelautan (LP2T-SPK) Konawe Sulawesi Tenggara. Rancangan penelitian ini adalah eksperimen pre post test only control group design dengan uji analisis data menggunakan uji nonparametrik yaitu Uji Kruskal Wallis. Hasil analisis penelitian menunjukan bahwa ekstrak visceral abalon tropis Haliotis asinina terbukti paling efektif dalam mempercepat regenerasi histologi luka sirip kaudal pada ikan nila (Nila oreochromis) dibandingkan dengan kelompok perlakuan mucus dan kelompok kontrol dengan tingkat kemaknaan (U = 0,000 p = 0,000). This study aimed to analyze the effectiveness of the visceral extract of tropical abalone Haliotis asinina in accelerating the regeneration of caudal fin wound of tilapia (Oreochromis). This research was carried out in July 2023 at the Institute for the Assessment and Application of Fisheries and Marine Resources Technology (LP2T-SPK) Konawe, Southeast Sulawesi. The design of this study was an experimental pre post test only control group design with data analysis using a nonparametric test, namely the Kruskal Wallis Test. The resulth of the study showed that the visceral extract of tropical abalone Haliotis asinina proved to be the most effective in accelerating the histological regeneration of caudal fin wounds of tilapia (Nila oreochromis) compared to the mucus treatment group and the control group with a significance level (U = 0.000 p = 0.000).
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Abalone fisheries"

1

Godfrey, Brian Peter. "The potential of abalone stock enhancement in the Eastern Cape Province of South Africa." Thesis, Connect to this title online, 2003. http://eprints.ru.ac.za/23/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Hancock, Andrew T. "The biology and fishery of Roe's abalone Haliotis roei Gray in south-western Australia, with emphasis on the Perth fishery." Connect to this title online, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0068/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Hancock, Andrew. "The biology and fishery of Roe's abalone Haliotis roei Gray in south-western Australia, with emphasis on the Perth fishery /." Connect to this title, 2004. http://theses.library.uwa.edu.au/adt-WU2004.0068.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Tiravanit, Kanit. "Supply chain design for abalone farming in Thailand." Online version, 2003. http://www.uwstout.edu/lib/thesis/2003/2003tiravanitk.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Gerber, Werner Hugo. "Enhancing the competitive advantage of the South African cultivated abalone industry." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/49946.

Full text
Abstract:
Thesis (MSc(Agric))--University of Stellenbosch, 2004.
ENGLISH ABSTRACT: The pnmary alm of this study was to investigate the national competitive advantage of the South African abalone industry. A further aim was therefore to investigate the environment, in which the South-African abalone industry operates. Secondary aims included presenting a detailed description of the roleplayers in the South African abalone industry, and considering whether the South African abalone industry can be made more competitive and, if so, how this can be achieved. The achievement of these aims required a framework to establish which data is necessary for the task. The framework selected involved a combination of Porter's Five Forces analysis and Diamond Model. The study suggests that South African abalone firms should promote South African abalone more actively, invest more funds in human resources, and that the industry's faith in government needs to be restored, which can be achieved by improving the services offered by public institutions like the South African Bureau of Standards (SABS), the Department of Trade and Industry (DTI) and Marine and Coastal Management (M&CM).
AFRIKAANSE OPSOMMING: Die doel met die studie was om die nasionale kompeterende voordeel van die Suid Afrikaanse perlemoen industrie te ondersoek. Om dit te bereik, moes die omgewing waarin die industrie fuksioneer ontleed en die rolspelers in die industrie deeglik beskryf word. 'n Verdere doel was om te bepaal of dit moontlik is om die kompeterendheid van die industrie te verhoog, en indien wel, hoe dit bereik kan word. Die raamwerk wat gekies is om die doelstellings te bereik bestaan uit 'n kombinasie van Porter se "Five Farces" analise en "Diamond Model". Die resultate dui aan dat die industrie Suid-Afrikaanse perlemoen meer aktief moet bekendstel, individuele ondernemings meer in hul menslike hulpbronne moet investeer, en dat die industrie se vertroue in die nasionale regering herstel moet word, deur die dienste te verbeter wat deur publieke instellings soos die Suid-Afrikaanse Buro van Stanaarde (SABS), Departement Handel en Nywerheid en Mariene- en Kusbestuur verskaf word.
APA, Harvard, Vancouver, ISO, and other styles
6

Riddin, Nicholas Alwyn. "Growth and gonad size in cultured South African abalone, Haliotis midae." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001651.

Full text
Abstract:
According to farm records, cultured Haliotis midae (50-70 g.abalone⁻¹) were growing 10% slower in winter when compared to summer. This reduction in growth rate also coincided with enlarged gonads. Initial trials showed that there were differences in mean monthly growth rates ranging from 1.97 – 5.14 g abalone⁻¹ month⁻¹, and gonad bulk index (GBI) also varied between months (GBI range: 26.88 ± 12.87 to 51.03 ± 34.47). The investment of energy into gonad tissue growth did not compromise whole body growth as the abalone continued to gain weight throughout the reproductive periods, probably due to gonadal growth. Growth of this size class of abalone was not influenced by water temperature or day length, suggesting favourable on-farm culture conditions (regression analyses, p > 0.05). There is no need to implement a seasonal dietary regime. Cultured H. midae were fed artificial diets with different protein sources, including only soya, only fishmeal, a combination of soya and fishmeal, and these were compared to kelp-fed abalone. Kelp-fed abalone grew slower than those fed artificial feeds (p>0.05). Gonad growth was the greatest when soya meal was included in the diet (average GBI: 74.91 ± 23.31), while the average gonad size of abalone fed the fishmealbased diet had gonads which were 38% smaller, and kelp-fed abalone had gonads which were 75% smaller than those of the abalone fed on diets containing soya meal. The increased gonad mass in abalone fed on diets including soya meal could be attributed to phytoestrogenic activity, as a result of the presence of isoflavones found in the soya plant; this remains to be tested. The use of soya in brood stock diet development is advised. The influence of dietary protein to energy ratio (1.41 – 2.46 g MJ⁻¹) on growth and gonad size was tested. Protein and energy levels within the ranges tested (22 and 33% protein; 13.5 and 15.6 MJ kg⁻¹) did not interact to influence growth rates of cultured H. midae. GBI increased from 50.67 ± 4.16 to 83.93 ± 9.35 units as a function of dietary protein to energy ratio (y = 42.02 x⁰·⁸¹; r² = 0.19; regression analysis: F₁¸₃₈ = 8.9; p = 0.005). In addition, protein level influenced gonad size, with gonad growth being greater in abalone fed the high protein diet (factorial ANOVA: F₁¸₃₂ = 7.1, p = 0.012). Canning yields were reduced by 7% when the protein content was increased, while increasing the quantity of dietary energy improved canning yields by ~ 6% (one-way ANOVA: F₁¸₂₈ = 14.4, p= 0.001). The present study provided evidence that although growth rates are varying seasonally, reproductive investment is not hindering weight gain. Gonad growth can be influenced if desired by farms, depending on the level of soya inclusion, as well as the protein to energy ratio in the diet. Monthly variation in growth and gonad size, as well as the influence of diet on gonad growth were highlighted, and the implications for farm application and further research were discussed.
APA, Harvard, Vancouver, ISO, and other styles
7

De, Greef Kimon. "Booming illegal abalone fishery in Hangberg: Tough lessons for small-scale fisheries governance in South Africa." Master's thesis, University of Cape Town, 2014. http://hdl.handle.net/11427/9187.

Full text
Abstract:
Includes bibliographical references
Marine capture fisheries around the world are widely perceived to be in a state of crisis, with growing recognition that conventional resource-centred management strategies are insufficient to counter ongoing problems of overexploitation. This is considered particularly true in the small‐scale sector, which employs the overwhelming majority of the world’s fishers but has historically been overlooked. To manage marine resources more sustainably, new approaches to fisheries governance have been sought that recognise the complex nature of fisheries systems, paying attention to the social dimensions of fisheries management in addition to important ecological processes. In South Africa, many of these new approaches have been embraced in a recently adopted policy for the small-scale sector. Attempts to reform marine fisheries have been ongoing in the country since the end of apartheid (a system of legalised racial segregation and white supremacy that ruled for almost 50 years) but have largely failed to bring meaningful change to impoverished fishing communities. Frustration at ineffective reform has contributed to widespread non-compliance – most notably in the abalone fishery, which has collapsed in the face of rampant poaching, driven by a lucrative, illegal export market to the Far East. Although the new small-scale fisheries (SSF) policy has been hailed as a progressive shift in thinking, questions remain about how it is to be implemented. One major challenge will be dealing with illegal fishing. The purpose of this study, was to profile the human dimensions of abalone poaching in the Cape Town fishing community of Hangberg and to draw lessons for implementing the new SSF policy. A qualitative multi-method research approach, based mainly on unstructured interviews and participant observation, was used to access the clandestine fishery and investigate its historical development, current structure, scale and methods of operation and main socio-economic drivers and impacts. It was found that abalone poaching has become deeply embedded in Hangberg, having evolved into a highly organized boat-based fishery in a period of less than 15 years. At least five local poaching groups – representing some 250 individuals in total – currently used dedicated high-powered vessels to access reefs around the Cape Peninsula. Profits earned from poaching are substantial but vary, with poachers operating according to a loose hierarchy and performing a range of different tasks in the fishery. This variation notwithstanding, the illegal fishery appears to have become a mainstay of the impoverished local economy, funding poachers’ expensive lifestyles, in addition to contributing more meaningfully to the livelihoods of an estimated 1000 residents.
APA, Harvard, Vancouver, ISO, and other styles
8

Hart, Leslie Christine. "Evaluating Recruitment Seasonality of Red Abalone (Haliotis rufescens) to Inform Fisheries Management and Conservation Policy." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1889.

Full text
Abstract:
Recruitment, the addition of new individuals to a population, must be understood to make predictions about population growth of marine invertebrates. Red abalone (Haliotis rufescens) represent a former important commercial fishery in California, and until recently, supported a major recreational fishery. However, there have been statewide declines since the 1960s due to overfishing, disease, and climatic factors. Thus, understanding population dynamics to inform management and population restoration is critical. Recruitment dynamics of red abalone are poorly understood, with no prior knowledge of seasonal trends. To address this knowledge gap, I assessed monthly (July 2016-June 2017) and annual (2012-2016) settlement rates of red abalone in the Monterey Bay, which has low density abalone populations due to sea otter predation. I evaluated associations between abalone recruitment and oceanographic factors (temperature, wave forces, and upwelling index) and food availability (kelp density) to understand potential predictors of recruitment. Abalone recruitment occurred year round, with generally higher recruitment in late summer to early fall (July-October) and peaks in August and October. This is the first demonstration of year-round abalone recruitment in the field. On a monthly basis, there were no statistically significant relationships between recruitment and oceanographic factors or food availability. Annual abalone recruitment was consistent in all years, with the exception of 2015 when recruitment majorly decreased during the second year of the North Pacific marine heatwave (i.e., warm blob and El Niño Southern Oscillation (ENSO) events). The failure of recruitment during only the second year of warm temperature suggests that prolonged extreme temperatures lead to reproductive failure. The consistent annual recruitment in the Monterey Bay contrasts with sporadic recruitment observed in Sonoma and Mendocino Counties in northern California. This finding was unexpected because red abalone in northern California were twice as dense as those in Monterey Bay at the time of the study. Possible hypotheses behind the observed consistent recruitment in Monterey Bay despite low densities include that: sheltered embayments retain larvae and promote recruitment, predation by sea otters aggregates abalone in crevices and promotes fertilization success, and the perennially present Macrocystis pyrifera kelp forests better support abalone growth and fecundity than northern California forests dominated by annual Nereocystis leutkeana.
APA, Harvard, Vancouver, ISO, and other styles
9

Nicholson, Gareth Hurst. "Towards understanding the effects of stocking density on farmed South African abalone, Haliotis Midae." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1015646.

Full text
Abstract:
The profitability of abalone farms is heavily influenced by their production per unit of grow-out space. With farms having physically expanded to the maximum, and with increasing production costs, one of the most realistic ways for farms to increase their production is through optimizing stocking densities. The effect of stocking density on Haliotis midae performance is undocumented and optimal stocking densities for this species have not been determined. Experiments were conducted under farm conditions to investigate the effects of four different stocking densities (16 %, 20 %, 22 % and 24 % of available surface area) on growth, production and health of three different size classes of abalone (15-35 g, 45-65 g, and 70-90 g start weight). Each treatment was replicated four times and trials ran over a period of eight months with measurements being made at four month intervals. Abalone behaviour was observed during the trials in the experimental tanks. Weight gain per abalone decreased with an increase in density for all tested size classes (5.04 ± 0.18 to 2.38 ± 0.17; 5.35 ± 0.21 to 4.62 ± 0.29; 7.97 ± 0.37 to 6.53 ± 0.28 g.abalone-1.month-1 for the 15-35, 45-65 and 70-90 g classes respectively, with an increased density of 16 to 24 %). Individual weight gain of 15-35 g abalone was similar at stocking densities of 16 % and 20 % while weight gain of 45-65 g and 70-90 g abalone decreased when density was increased above 16 %. Biomass gain (kg.basket-1.month-1) was not affected by stocking density in the 15-35 g and 45-65 g size classes (1.29 ± 0.02 and 0.97 ± 0.02 kg.basket-1.month-1 respectively). However, the biomass gained by baskets stocked with 70-90 g abalone increased with stocking density (1.08 ± 0.02 to 1.33 ± 0.02 kg.basket-1.month-1) with an increased density of 16 to 24 %) and did not appear to plateau within the tested density range (16 to 24 %). Food conversion ratio did not differ significantly between densities across all size classes. Stocking density did not have a significant effect on abalone condition factor or health indices. The proportion of abalone above the level of the feeder plate increased with density (7.26 ± 1.33 to 16.44 ± 1.33 with an increased density of 16 to 24 %). As a proportion of abalone situated in the area of the basket, the same proportions were situated on the walls above the feeder plate and on the feeder plate itself irrespective of stocking density (p > 0.05). Higher proportions of animals had restricted access to feed at higher stocking densities (p = 0.03). The amount of formulated feed available on the feeder plate did not differ between stocking densities throughout the night (p = 0.19). Individual abalone spent more time above the feeder plate at higher stocking densities (p < 0.05). The percentage of time above the feeder plate, spent on the walls of the basket and on the feeding surface was not significantly different at densities of 20 %, 22 % and 24 % (p > 0.05) but abalone stocked at 16 % spent a greater percentage of time above the feeder plate on the feeding surface (83.99 ± 6.26 %) than on the basket walls (16.01 ± 6.26 %). Stocking density did not affect the positioning of abalone within a basket during the day or at night. Different size H. midae are affected differently by increases in stocking density in terms of growth performance. Findings from this research may be implemented into farm management strategies to best suit production goals, whether in terms of biomass production or individual weight gain. The fundamental mechanisms resulting in reduced growth at higher densities are not well understood, however results from behaviour observations suggest that competition for preferred attachment space and feed availability are contributing to decreased growth rates. With knowledge of abalone behaviour at different densities, innovative tank designs may be established in order to counter the reduction in growth at higher densities.
APA, Harvard, Vancouver, ISO, and other styles
10

Ayres, Devin William Philip. "Effect of diet and sex-sorting on growth and gonad development in farmed South African abalone, Haliotis midae." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1010856.

Full text
Abstract:
Abalone, Haliotis midae, farmers in South Africa that feed formulated diets reported a periodic drop in abalone growth during periods of increased gonad development. A large drop in abalone biomass was noticed after presumed spawning events. This study was aimed to determine the effect of diet and sex-sorting on gonad development in abalone. Experiments were conducted on a commercial abalone farm from July 2012 to the end of June 2013. Isonitrogenous and isoenergetic diets were formulated with two protein sources. A fishmeal and soybean meal (S-diet) diet and a fishmeal only (F-diet) diet were fed to abalone (50 - 70 g abalone⁻¹) over 12 months. Weight and length gain, gonad bulk index (GBI), visceral index (%) and meat mass index (%) were determined monthly and seasonally. A histological study on the female gonads was conducted. This study also included an experiment to test the effect of sex-sorting (70 - 80 g abalone⁻¹) on growth and body composition with treatments including males (M), females (F) and equal numbers of males and females (MF). Weight gain and length gain were faster in S-diet-fed abalone (RM-ANOVA, F ₍₁, ₁₆₎ = 7.77, p = 0.01; F ₍₁, ₆₉₎ = 49.9, p < 0.001, respectively). Gonad development was significantly affected by the inclusion of soybean meal with S-diet-fed abalone showing higher GBI-values than F-diet-fed abalone (RM-ANOVA, F ₍₁, ₃₃)= 16.22, p = 0.0003). Male abalone had higher GBI-values than females (RM-ANOVA, F ₍₁, ₃₃₎ = 39.87, p < 0.0001). There was no significant difference in average feed conversion ratio (FCR) between diets over time (RM-ANOVA, F ₍₁, ₂₁₎ = 0.008, p = 0.97). However, average FCR-values were significantly highest between November 2012 and March 2013, the presumed spawning season. The visceral mass (gut and gonad) as a proportion of whole mass (visceral index, %) was significantly higher in abalone fed the S-diet (RM-ANOVA; F ₍₁, ₆₉₎ = 68.06, p < 0.0001). There was no difference in meat mass index (%) between diets for both male and female abalone (RM-ANOVA; F ₍₇, ₂₄₈₎ = 0.80, p = 0.60; F ₍₇, ₂₄₁₎ = 1.7, p = 0.11,respectively). Meat mass index significantly decreased from September 2012 to February 2013 coinciding with the period of high GBI-values. The distribution of oocyte maturity stages differed between diets. The majority of oocytes within S-diet-fed abalone were fully mature stage 8 oocytes compared to a majority of stage 7 oocytes in F-diet-fed abalone. Histology corroborated peaks in GBI-values for abalone fed both diets. There was no significant difference in growth, GBI, visceral index (%) and meat mass index (%) between abalone sorted into monosex and mixed-sex populations. Thus, the presence of the opposite sex did not have an effect on growth and gonad mass in H. midae. The phytoestrogens daidzin, glycitin, genistin, daidzein, glycitein and genistein were present in soybean meal and only traceable amounts were found in the F-diet. This study provided evidence that soybean meal present in formulated feed affected growth and gonad development in H.midae. The difference in the distribution of the maturity stages of oocytes was affected by diet. Sex-sorting abalone into monosex and mixed-sex populations had no influence on weight and length gain and gonad development.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Abalone fisheries"

1

International, Symposium on Abalone Biology Fisheries and Culture (1st 1989 La Paz Baja California Sur Mexico). Schedule & abstracts. La Paz, Baja California Sur, México: El Centro, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

National, Abalone Convention (2001 Adelaide S. Aust ). Charting our future: 2001 proceedings, National Abalone Convention, Adelaide, South Australia, 19-21 August 2001. [Adelaide, S. Aust.]: Abalone Industry Association of South Australia, Inc., 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

National Abalone Convention (2001 Adelaide, S. Aust.). Charting our future: Proceedings. [Adelaide, S. Aust.]: Abalone Industry Association of SA Inc., 2001.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

S, Jamieson G., and Francis K, eds. Invertebrate and marine plant fishery resources of British Columbia. Ottawa: Dept. of Fisheries and Oceans, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

International Symposium on Abalone (1st 1989 La Paz, Mexico). Abalone of the world: Biology, fisheries and culture. Oxford: Fishing News, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Kyoto (Japan : Prefecture). Nōrin Suisanbu. and Kyōto-fu Saibai Gyogyō Suishin Kyōgikai., eds. Awabi no saibai gyogyō. [Kyoto]: Kyōto-fu Nōrin Suisanbu, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Kiyotake, Yūji. Awabi to kodai kokka: "Engishiki" ni miru shokuzai no seisan to kanri. Tōkyō: Heibonsha, 2021.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

McShane, P. E. Victorian abalone stock assessment: Program CO6 : fourth review November 1987. [S.l.]: Marine Science Laboratories, 1987.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

A, Breen P., and Canada. Dept. of Fisheries and Oceans., eds. Northern abalone, Haliotis kamtschatkana, in British Columbia: Fisheries and synopsis of life history information. Ottawa: Fisheries and Oceans, Communications Directorate, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

California Abalone Industry: A Pictorial History. Best Publishing Company, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Abalone fisheries"

1

Cook, Peter A. "Abalone aquaculture." In Abalone: Biology, Ecology, Aquaculture and Fisheries, 347–61. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-814938-6.00011-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Stone, David A. J., Matthew S. Bansemer, and Krishna-Lee Currie. "Abalone nutrition." In Abalone: Biology, Ecology, Aquaculture and Fisheries, 9–44. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-814938-6.00002-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Mundy, Craig, Malcolm Haddon, and Jaime McAllister. "Assessment of commercial abalone fisheries." In Abalone: Biology, Ecology, Aquaculture and Fisheries, 291–330. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-814938-6.00009-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Cook, Peter A. "Abalone reseeding and enhancement." In Abalone: Biology, Ecology, Aquaculture and Fisheries, 331–46. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-814938-6.00010-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Cook, Peter A. "The international abalone market." In Abalone: Biology, Ecology, Aquaculture and Fisheries, 373–82. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-814938-6.00013-0.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Waugh, Geoffrey. "Management of the New South Wales Abalone Fishery." In Fisheries Management, 191–225. Routledge, 2019. http://dx.doi.org/10.4324/9780429050268-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Cook, Peter A. "Business planning for abalone aquaculture." In Abalone: Biology, Ecology, Aquaculture and Fisheries, 383–97. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-814938-6.00014-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Rogers-Bennett, Laura. "Ecology of Eastern Pacific abalone." In Abalone: Biology, Ecology, Aquaculture and Fisheries, 251–89. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-814938-6.00008-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Cook, Peter A. "Introduction, taxonomy, and general biology of abalone." In Abalone: Biology, Ecology, Aquaculture and Fisheries, 1–8. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-814938-6.00001-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

You, Wei Wei. "History and current status of abalone aquaculture in China." In Abalone: Biology, Ecology, Aquaculture and Fisheries, 363–71. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-814938-6.00012-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Abalone fisheries' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography