The incidental capture of five species of sea turtles by coastal setnet fisheries in the Eastern waters of Taiwan

Cheng, I-Jiunn; Chen, Tien Hsi

doi:10.1016/s0006-3207(97)00027-x

Cited by 35 publications

(18 citation statements)

References 8 publications

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“…The incidence of sea turtle interactions was found to be higher during winter and spring in swordfish-and tuna-targeted trips, respectively. A similar observation was found in Taiwanese coastal setnet fisheries for the period 1991-1995 where most turtle interactions of same turtle species occurred between November and March (Cheng and Chen, 1997).…”

Section: Resultssupporting

confidence: 82%

A Poisson and negative binomial regression model of sea turtle interactions in Hawaii's longline fishery

Pradhan¹,

Leung²

2006

Fisheries Research

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Sea turtle interactions with the longline fishery in Hawaii have become a serious concern in recent years. Various measures, including a swordfish harvest ban, have been adopted to protect sea turtles. This study explores the factors and degree of sea turtle interactions with Hawaii's pelagic longline fishery, i.e. the production of undesirable outputs in the pursuit of an economic activity, in an analytical framework of rare events using the count data models for the period 1994-2003. The analysis was based on the type of trip, such as those targeting tuna or swordfish. The fishing technologies associated with the choice of trip or target species, season, and turtle population explained turtle interactions with the longline fishery. The impact of a fishing vessel's previous history of turtle interactions had a negligible impact on subsequent interactions. In the absence of new longline fishing technologies to dramatically avert sea turtle interactions, there are about 6% and 55% chance that at least one turtle per trip may be encountered in tuna-and swordfish-targeted fishing trips, respectively. This study confirms that more turtle interactions are associated with the swordfish-targeted trips. Several of the factors that contributed substantially to turtle interactions can be feasibly regulated. Furthermore, the conservation and management of sea turtles require increased policy dialogues and cooperation among the coastal nations vis-à-vis the adaptation to "turtle-friendly" fishing technologies.

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Section: Resultssupporting

confidence: 82%

A Poisson and negative binomial regression model of sea turtle interactions in Hawaii's longline fishery

Pradhan¹,

Leung²

2006

Fisheries Research

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“…This size is similar to that at which pelagic juveniles in the Pacific appear to switch to a neritic lifestyle (e.g., Balazs, 1980;Limpus et al, 2005). The size distributions of the three FG, however, clearly demonstrated a characteristic bimodality with a low frequency of turtles of 50-70 cm SCL, similar to reports from FG in Shoalwater Bay in eastern Australia (Limpus et al, 2005), and in eastern Taiwan (Cheng and Chen, 1997). Bresette et al (2010) also reported a bimodal size distribution of pooled green turtles from Mooney Harbor and the eastern Quicksands, west of Key West, Florida, USA, although the bimodality was not noted in their study.…”

Section: Size Compositions In the Fg And Population Trends In The Natsupporting

confidence: 84%

Ontogenetic habitat shifts of green turtles (Chelonia mydas) suggested by the size modality in foraging aggregations along the coasts of the western Japanese main islands

Hamabata

Hikida

Okamoto

et al. 2015

Journal of Experimental Marine Biology and Ecology

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a b s t r a c tTo understand the life histories and ontogenetic habitat utilization of green turtles along the coasts of the western Japanese main islands, we collected size frequency and genetic data of green turtles captured by pound nets in three foraging grounds (FG): Nomaike (n = 38), Muroto (n = 93), and Kumano-nada (n = 31), and compared their natal origins among different size classes. Population genetic analyses based on an 820-bp fragment of mitochondrial DNA showed that the three FG were part of a single multiple-coast FG. Although turtles from all size classes originated mainly from rookeries in the Ogasawara Group, the size distributions clearly exhibited bimodality, with low occurrences of turtles in the 50-70-cm straight carapace length (SCL) range. The bimodal size distributions could not be attributed to demographic shifts in rookeries, because the number of female green turtles in Ogasawara has exhibited an increasing trend since 1979. We also examined whether factors such as seasonality and predation risk could have caused the size bimodality. There were, however, no strong relationships between sea-surface temperatures when turtles were captured and the sizes of the turtles (r 2 b 0.2), and it appeared that predation risk could not result in the size modality observed in the FG. Our results strongly suggest that after switching from a pelagic to a neritic lifestyle, the green turtles in the neritic FG along the western Japanese main islands undergo another ontogenetic habitat shift upon reaching~50-cm SCL. Here, we explore the possibility that developmental growth might stimulate a habitat shift, resulting in habitat differentiations by size and growth phase in the long-lived green turtle.

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“…Most importantly, according to Epperly et al [15] and Cheng and Chen [16], the greatest impact on the survival of these animals is the use of fishing equipment, with emphasis on the fishing nets that are recognized as a major factor in the mortality of sea turtles across the world [17]. In Brazil, the homemade devices are commonly used on the coast [18].…”

Section: Introductionmentioning

confidence: 99%

Attitudes and local ecological knowledge of experts fishermen in relation to conservation and bycatch of sea turtles (reptilia: testudines), Southern Bahia, Brazil

Braga

Schiavetti

2013

J Ethnobiology Ethnomedicine

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BackgroundThe use of ethnoecological tools to evaluate possible damage and loss of biodiversity related to the populations of species under some degree of threat may represent a first step towards integrating the political management of natural resources and conservation strategies. From this perspective, this study investigates fishermen’s ecological knowledge about sea turtles and attitudes towards the conservation and bycatch in Ilhéus, Southern Bahia, Brazil.MethodsFishermen experts semi-structured interviews were performed using snowball sampling method. The interviews consisted of a series of questions relating to the fishermen’s profile, structure and work equipment, the local ecological knowledge of fishermen about sea turtles and bycatch, a projective test, attitudes towards turtle conservation and beliefs and taboos regarding turtles. Indicators for quantitative comparisons of respondents in terms of their broad knowledge and attitudes towards turtle conservation were created. Correlation analyses were made between indicators of knowledge and attitude as well as the relationship between education level and knowledge and attitudes.ResultsThirty experts were interviewed for the study. The local ecological knowledge and attitudes of fishermen towards the conservation of sea turtles were respectively medium (0.43) and moderate (0.69) according to experts (based on Likert scale and Cronbach’s Alpha). Potential areas of spawning were reported from Barra Grande to Una covering the entire coast of Ilhéus. Methods for identifying the animal, behavior, and popular names were described by fishermen. The most recent captures of turtles were attributed to fishing line, but according to the respondents, lobster nets and shrimp traps are more likely to capture turtles. Knowledge and attitudes were weakly inversely correlated (r = −0.38, p = 0.04), and the education level of the respondent showed a positive correlation with positive attitudes towards turtle conservation (H = 8.33; p = 0.04). Life history, habitat, specific and exogenous taboos, beliefs and the use of hawksbill turtle to make glasses and other handcrafts are also reported in the study.ConclusionsMonitoring of spawning areas, preservation of traditional practices, strategies to moderate the use of fishery resources and the local ecological knowledge/attitudes can provide data to improve the conservation practices and management of sea turtles.

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The incidental capture of five species of sea turtles by coastal setnet fisheries in the Eastern waters of Taiwan

Cited by 35 publications

References 8 publications

A Poisson and negative binomial regression model of sea turtle interactions in Hawaii's longline fishery

A Poisson and negative binomial regression model of sea turtle interactions in Hawaii's longline fishery

Ontogenetic habitat shifts of green turtles (Chelonia mydas) suggested by the size modality in foraging aggregations along the coasts of the western Japanese main islands

Attitudes and local ecological knowledge of experts fishermen in relation to conservation and bycatch of sea turtles (reptilia: testudines), Southern Bahia, Brazil

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