Historical Knowledge of Sharks: Ancient Science, Earliest American Encounters and American Science, Fisheries, and Utilization

Castro, José Ignacio Fernández del

doi:10.7755/mfr.75.4.1

Cited by 13 publications

(22 citation statements)

References 12 publications

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“…Although the relative decrease in size in the present study is still low and the sampling period (three years) is not enough to detect robust trends, its combination with increases in the proportion of juveniles (up to 50% of the catches in 2008), could suggest a tendency towards the occurrence of suboptimal conditions for the fishery with the passing of time. Similar results with larger proportions of immature organisms in the catches were also observed by Tavares et al (2010) in the same region and are also observed in other elasmobranchs caught by artisanal fisheries of Venezuela (Tavares 2009, Tagliafico et al 2012, 2013.…”

Section: Discussionsupporting

confidence: 77%

“…Most of the Venezuelan marine resources are currently recognized to be in a state of overfishing (Mendoza 2015), and several elasmobranch fisheries have already shown a lack of precautionary management. The occurrence of high percentages of immature individuals and pregnant females in elasmobranch catches (Tavares 2009, Tagliafico et al 2012, 2013) must be avoided in order to preserve these valuable resources.…”

Section: Canis M Norrisi (Cervigón and Alcalá 1999) M Antarcticusmentioning

confidence: 99%

“…The vulnerability of sharks is well known and cases of overexploitation have been documented around the world (Musick et al 2000, Castro 2013). However, sustainable shark fisheries have been achieved in British Columbia and Australia as a result of rigorous management programmes (Walker 1998).…”

Section: Introductionmentioning

confidence: 99%

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Size of catch, reproduction and feeding of the small-eye smooth-hound, <em>Mustelus higmani</em> (Carcharhiniformes: Triakidae), in Margarita Island, Venezuela

et al. 2015

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Summary:Mustelus higmani is categorized as "least concern" according to the red list of the International Union for Conservation of Nature, but gaps in population trends occur in most of its distribution range. In Venezuela, this species has local importance because it is part of typical dishes. The aim of this work is to analyse the population structure, reproduction and feeding of M. higmani from Margarita Island's artisanal fishery landings for management purposes. Between 2006 and 2008, 2223 specimens were analysed: 1156 females (24.8-88.4 cm total length [TL]) and 1067 males (20-69.2 cm TL). Temporal variations in sex ratio and length class structure were detected. Changes in body size were detected throughout different years of sampling. A decrease in TL and an increase in immature specimens in the catch were observed in 2008. Mean length at maturity (L 50 ) was estimated at 46.7 cm TL for females and 47.6 cm TL for males. Female fecundity was 4±1.8 embryos (n=388). Length at birth was between 20 and 29 cm TL, and no differences in sex ratio were detected for embryos. Feeding analyses (n=266 stomachs) showed a diet mainly based on decapod crustaceans, small fish, stomatopods and cephalopods. The trophic level was 3.3, which shows feeding based on benthic and demersal species of the continental shelf, especially crustaceans.Keywords: shark fishery; elasmobranch; Chondrichthyes; artisanal fishery; Caribbean.Longitud de captura, reproducción y alimentación de la viuda amarilla, Mustelus higmani (Carcharhiniformes: Triakidae), en isla de Margarita, Venezuela Resumen: Mustelus higmani está catalogada con "preocupación menor" en la lista roja de la IUCN, sin embargo existen vacíos de información sobre la tendencia poblacional en la mayoría de su rango de distribución. En Venezuela, esta especie tiene gran importancia local porque es parte de platos típicos tradicionales. El objetivo del presente trabajo es analizar la estructura poblacional, reproducción y alimentación de los ejemplares de M. higmani provenientes de los desembarques de la pesca artesanal de isla de Margarita, para contribuir con el manejo de la especie. Durante 2006Durante -2008Durante , fueron analizados 2223Durante ejemplares: 1156.4 cm LT) y 1067 machos (20-69.2 cm). Fueron detectadas variaciones temporales en la proporción sexual y estructura de longitudes. Una disminución de la longitud total y un incremento de organismos inmaduros fueron observados durante el 2008. La longitud media de madurez sexual (L 50 ) fue estimada en 46.7 cm LT para las hembras y 47.6 cm LT para machos. La fecundidad uterina fue estimada en 4±1.8 embriones (n=388). Longitud cercana al nacimiento entre 20-29 cm LT, sin diferencias en la proporción sexual de embriones. Los análisis de alimentación (n=266 estómagos) muestran una dieta basada principalmente en crustáceos decápodos, peces pequeños, estomatópodos y cefalópodos. El nivel trófico calculado fue 3.3. La especie muestra una alimentación basada en especies demersales y del bentos habitantes de la plataform...

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Section: Discussionsupporting

confidence: 77%

Section: Canis M Norrisi (Cervigón and Alcalá 1999) M Antarcticusmentioning

confidence: 99%

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Size of catch, reproduction and feeding of the small-eye smooth-hound, <em>Mustelus higmani</em> (Carcharhiniformes: Triakidae), in Margarita Island, Venezuela

et al. 2015

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“…However, recreational shark fishing is a relatively new phenomenon. Historically, sharks were perceived as a nuisance to recreational anglers (Castro 2013). The social prestige and thrill bestowed on anglers from catching large predatory sharks can be seen in historical photographs on various online blogs from around the world dating back to as early as the 1920s (Authors, direct observation).…”

Section: Brief History Of Recreational Shark Fishingmentioning

confidence: 99%

Shark recreational fisheries: Status, challenges, and research needs

Gallagher

Hammerschlag

Danylchuk

et al. 2016

Ambio

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For centuries, the primary manner in which humans have interacted with sharks has been fishing. A combination of their slow-growing nature and high usevalues have resulted in population declines for many species around the world, and to date the vast majority of fisheriesrelated work on sharks has focused on the commercial sector. Shark recreational fishing remains an overlooked area of research despite the fact that these practices are popular globally and could present challenges to their populations. Here we provide a topical overview of shark recreational fisheries, highlighting their history and current status. While recreational fishing can provide conservation benefits under certain circumstances, we focus our discourse on the relatively understudied, potentially detrimental impacts these activities may have on shark physiology, behavior, and fitness. We took this angle given the realized but potentially underestimated significance of recreational fishing for shark conservation management plans and stock assessments, in hopes of creating a dialogue around sustainability. We also present a series of broad and focused research questions and underpin areas of future research need to assist with the development of this emergent area of research.

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“…Elasmobranch overfishing has been documented since the late 1940s (Castro, 2013) and recent analyses have demonstrated that population diminution has occurred around the world, with at least one in 4 species being actually threatened with extinction (Dulvy et al, 2014). Nonetheless, numerous species of rays and skates have been poorly studied, preventing definition of their status and identification of threats (Molina and Lopez, 2015).…”

mentioning

confidence: 99%

Exploitation and reproduction of the bullnose ray (Myliobatis freminvillei) caught in an artisanal fishery in La Pared, Margarita Island, Venezuela

Tagliafico¹,

Ehemann²,

Rangel³

et al. 2016

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Abstract-Species of the genus Myliobatis have been poorly assessed because of a lack of available information regarding their capture and life history. We provide valuable data based on the commercial landings of the bullnose ray (Myliobatis freminvillei), which we studied during 2 separate time periods (October 2005-December 2007 and JanuaryDecember 2013. A total of 187 individuals were analyzed: 85 females (24.0-96.0 cm in disc width [DW]) and 102 males (22.8-118.0 cm DW). There was no difference in the overall sex ratio (females to males: 4:5); however, differences were found between the annual sex ratio in 2005, 2006, and 2013. Estimated capture per unit of effort for this species was 0.8 individuals/trip (standard deviation [SD] 1.3) or 2.9 kg/trip (SD 5.5), showing an increase in effort through time and significant differences between years. Approximately 25% of both sexes were shorter than the estimated median DW at maturity. No pattern in the reproductive cycle was identified because of the lack of landings during several months; however, mature individuals were observed frequently throughout the study period; gravid females were observed on only 2 occasions. This study provides baseline biological information on the life history of the bullnose ray for necessary fishery management.

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Historical Knowledge of Sharks: Ancient Science, Earliest American Encounters and American Science, Fisheries, and Utilization

Cited by 13 publications

References 12 publications

Size of catch, reproduction and feeding of the small-eye smooth-hound, <em>Mustelus higmani</em> (Carcharhiniformes: Triakidae), in Margarita Island, Venezuela

Size of catch, reproduction and feeding of the small-eye smooth-hound, <em>Mustelus higmani</em> (Carcharhiniformes: Triakidae), in Margarita Island, Venezuela

Shark recreational fisheries: Status, challenges, and research needs

Exploitation and reproduction of the bullnose ray (Myliobatis freminvillei) caught in an artisanal fishery in La Pared, Margarita Island, Venezuela

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