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Catch composition, catch per unit effort and size of blue swimming crab (Portunus pelagicus) from small-scale fishing in Phetchaburi province Full text
2020
Supatcha Lurkpranee(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Sansanee Wangvoralak(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Urairathr Nedtharnn(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Monissa Srisomwong(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Jirapast Adjimangkunl(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Jiraporn Trisak(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Krerkkrai Songin(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management)
Thailand trade in aquatic fauna listed in CITES Full text
2020
Varisara Palodom(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Sirisuda Jumnongsong(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Urairathr Nedtharnn(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management)
Satisfaction of downstream fishery industry operators on governmental measures of traceability system Full text
2020
Suwimon Meechai(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Jirarpast Adjimangkunl(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Sansanee Wangvoralak(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Urairathr Nedtharnn(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management)
Development of fisheries laws and regulations database and search engine system Full text
2020
Pasara Rattanaphisit(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management) | Sirisuda Jumnongthong(Kasetsart University, Bangkok (Thailand). Faculty of Fisheries. Department of Fisheries Management)
Compliance with rights-based fisheries management is associated with fishermen's perceptions of peer compliance and experience: A case study in the Upper Gulf of California Full text
2020
Marín Monroy, Elvia Aída | Romero-Canyas, Rainer | Fraire-Cervantes, Jose A. | Larson-Konar, Dylan | Fujita, Rodney M.
Understanding social drivers behind fisheries regulation compliance, as well as the perceived benefits from different types of fisheries management, is necessary to optimize strategies intended to preserve fish stocks while allowing for the economic well-being of the communities that harvest them. We conducted a survey to capture fishermen's and community members' perceptions of the current rights based management of the gulf curvina (Cynoscion othonopterus) fishery in the Upper Gulf of California, their participation in decision-making, as well as their motivation to comply with regulations and their own assessment of their quality of life. We designed a questionnaire that was used in structured interviews with fishermen and other community members. The results showed a perception of low participation in decision-making process that shaped the rights-based management system, and that a large part of the community did not perceive this system as beneficial to their income, well-being or quality of life despite empirical evidence of higher revenues. We also found a significant relation between perceptions of overall compliance with fishery regulations and of fishermen experience with fishermen's own compliance rate.
Show more [+] Less [-]Socio-economic characteristics of small-scale fisheries in the Aegean Sea, Turkey (eastern Mediterranean) Full text
2020
R. Birkan | F. Öndes
Socio-economic characteristics of small-scale fisheries in the Aegean Sea, Turkey (eastern Mediterranean) Full text
2020
R. Birkan | F. Öndes
Background. The socio-economic characteristics of small-scale fisheries have rarely been documented in the eastern Mediterranean. This study aimed to determine the current socio-demographic status, historical changes in demography and fishing activity, fishing expenditures, and the main problems of small-scale fisheries in the Aegean Sea. Materials and methods. Data were collected in 2018, using face-to-face questionnaires from small-scale fishers (n = 190) representing three sub-regions (northern, central, and southern Aegean Sea). The questionnaire included information regarding the main characteristics of fishing vessels, demographic characteristics of fishers, expenditures involved, and other important issues. Furthermore, some demographic characteristics (e.g., age and marriage status) and fishery-specific characteristics (e.g., active fisher ratio) observed in our study, were compared to the published data, to reveal if any changes have prevailed historically. Results. The mean age of fishers was 50 ± 10 years, and many of them were married males with primary school education. The highest two fisheries expenditures were fuel and oil expenses and personnel (crew) expenses. The fisheries expenditures did not show a statistically significant difference in terms of geographical location. However, there was a significant difference in the total fisheries expenditures depending on fishery type; fishers who use an encircling net reported higher expenditures, in comparison to other fishing types. The results showed that the active fisher ratio and the ratio of fishers who do not have other income has decreased significantly over the last 10 years. In addition, engine power (kW) showed a significant increase over the last 15–16 years. The main problems identified were insufficient inspection, illegal fisheries, and a decrease in stocks. Conclusion. Increased fishing expenditures and decreasing fish stocks in the Aegean Sea resulted in a decrease in the number of active fishers. Therefore, many fishers tended to have additional jobs, and some of them considered leaving fishing. To maintain the sustainable management of the small-scale fisheries in Turkey, we suggested that the catch and fishing effort should be monitored using the mandatory logbooks, and the hook number should be standardized.
Show more [+] Less [-]Socio-economic characteristics of small-scale fisheries in the Aegean Sea, Turkey (eastern Mediterranean) Full text
2020
Birkan,R. | Öndes,F.
Background. The socio-economic characteristics of small-scale fisheries have rarely been documented in the eastern Mediterranean. This study aimed to determine the current socio-demographic status, historical changes in demography and fishing activity, fishing expenditures, and the main problems of small-scale fisheries in the Aegean Sea. Materials and methods. Data were collected in 2018, using face-to-face questionnaires from small-scale fishers (n = 190) representing three sub-regions (northern, central, and southern Aegean Sea). The questionnaire included information regarding the main characteristics of fishing vessels, demographic characteristics of fishers, expenditures involved, and other important issues. Furthermore, some demographic characteristics (e.g., age and marriage status) and fishery-specific characteristics (e.g., active fisher ratio) observed in our study, were compared to the published data, to reveal if any changes have prevailed historically. Results. The mean age of fishers was 50 ± 10 years, and many of them were married males with primary school education. The highest two fisheries expenditures were fuel and oil expenses and personnel (crew) expenses. The fisheries expenditures did not show a statistically significant difference in terms of geographical location. However, there was a significant difference in the total fisheries expenditures depending on fishery type; fishers who use an encircling net reported higher expenditures, in comparison to other fishing types. The results showed that the active fisher ratio and the ratio of fishers who do not have other income has decreased significantly over the last 10 years. In addition, engine power (kW) showed a significant increase over the last 15–16 years. The main problems identified were insufficient inspection, illegal fisheries, and a decrease in stocks. Conclusion. Increased fishing expenditures and decreasing fish stocks in the Aegean Sea resulted in a decrease in the number of active fishers. Therefore, many fishers tended to have additional jobs, and some of them considered leaving fishing. To maintain the sustainable management of the small-scale fisheries in Turkey, we suggested that the catch and fishing effort should be monitored using the mandatory logbooks, and the hook number should be standardized.
Show more [+] Less [-]Operation process and difficulties encountered in the implementation of "Fishing Village Revitalizing Plans"
2020
Hokimoto, K. (National Fisheries University (Japan). Department of Fisheries Distribution and Management)
This study examines the operation process and difficulties encountered in the implementation of regional "fishing village revitalizing plans." First, data published by the Fisheries Agency is examined and the efforts of local villages are classified into two categories: efforts related to the usage and management of the local coastal area and efforts related to the distribution and sales of fish products. Second, the process of forming and implementing plans of action is examined and problems concerning the operation of such plans are identified. Finally, case studies of commendation winners are examined in order to identify the features of the operation process. This study concludes that the driving force for change and the construction of networks are very important for the success of "fishing village revitalizing plans."
Show more [+] Less [-]The mitigation hierarchy for sharks: A risk‐based framework for reconciling trade‐offs between shark conservation and fisheries objectives Full text
2020
Booth, Hollie | Squires, Dale | Milner‐Gulland, Eleanor Jane
Sharks and their cartilaginous relatives are one of the world's most threatened species groups. The primary cause is overfishing in targeted and bycatch fisheries. Reductions in fishing mortality are needed to halt shark population declines. However, this requires complex fisheries management decisions, which often entail trade‐offs between conservation objectives and fisheries objectives. We propose the mitigation hierarchy (MH)—a step‐wise precautionary approach for minimizing the impacts of human activity on biodiversity—as a novel framework for supporting these management decisions. We outline a holistic conceptual model for risks to sharks in fisheries, which includes biophysical, operational and socioeconomic considerations. We then demonstrate how this model, in conjunction with the MH, can support risk‐based least cost shark conservation. Through providing examples from real‐world fishery management problems, we illustrate how the MH can be applied to a range of species, fisheries and contexts, and explore some of the opportunities and challenges hereto. Finally, we outline next steps for research and implementation. This is important in the context of increasing international regulation of shark fishing and trade, which must lead to reductions in shark mortality, while managing trade‐offs between conservation objectives and the socioeconomic value of fisheries.
Show more [+] Less [-]Re‐evaluation of reproductive cycle and fecundity of finetooth sharks Carcharhinus isodon (Valenciennes 1839) from the Northwest Atlantic Ocean, with new observations on ovarian cycle and reproductive endocrinology of biennially reproducing sharks Full text
2020
Brown, Amanda N. | Frazier, Bryan S. | Gelsleichter, Jim
To provide updated information on life history for improved fishery management, the reproductive cycle of the finetooth shark Carcharhinus isodon from Northwest Atlantic (NWA) populations was investigated by examining temporal changes in morphology and histology of reproductive organs. Changes in plasma concentrations of gonadal sex hormones in relation to reproductive stage were also examined. Increases in testis width, epididymis head width, plasma testosterone concentrations and occurrence of mature spermatozoa were observed in male sharks between December and April, suggesting a seasonal pattern in reproduction that culminates with copulatory activity in May. Increases in maximum follicular diameter, oviducal gland width, plasma 17β‐estradiol concentrations and occurrence of vitellogenic follicles were observed in non‐pregnant female sharks during the same time period along with the occurrence of newly pregnant females in May, demonstrating strong synchronicity between male and female reproductive cycles. Pregnant females bearing full‐term embryos were also observed in May, indicating that parturition occurs between mid‐May and early June and gestation requires 12 months. Only transient temporal changes in follicle size and oviducal gland width were observed in pregnant females, indicating that reproductive periodicity is biennial; nonetheless, a single female exhibiting signs of concurrent vitellogenesis and pregnancy was observed. Mean brood size ± S.D. was 3.9 ± 0.9 offspring/female. Fecundity was not significantly correlated with female size, in part due to an unexpectedly high rate of early embryo mortality, which occurred in 11% of pregnant females, and was more common in larger individuals. Changes in ovarian activity during mid‐pregnancy were observed, suggesting possible roles for the ovary in regulating some aspects of early to mid‐gestation. This study confirms that earlier characterizations of the reproductive cycle and fecundity in NWA finetooth sharks remain valid for use in fishery management. This study also highlights unusual features of finetooth shark pregnancy (e.g., early embryo death, mid‐pregnancy changes in ovarian function) that may have broader relevance to understanding elasmobranch reproduction.
Show more [+] Less [-]Views from the dock: Warming waters, adaptation, and the future of Maine’s lobster fishery Full text
2020
McClenachan, Loren | Scyphers, Steven | Grabowski, Jonathan H.
The ability of resource-dependent communities to adapt to climate change depends in part on their perceptions and prioritization of specific climate-related threats. In the Maine lobster fishery, which is highly vulnerable to warming water associated with climate change, we found a strong majority (84%) of fishers viewed warming water as a threat, but rank its impacts lower than other drivers of change (e.g., pollution). Two-thirds believed they will be personally affected by warming waters, but only half had plans to adapt. Those with adaptation plans demonstrated fundamentally different views of human agency in this system, observing greater anthropogenic threats, but also a greater ability to control the fishery through their own actions on the water and fisheries management processes. Lack of adaptation planning was linked to the view that warming waters result from natural cycles, and the expectation that technological advancements will help buffer the industry from warming waters.
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