Occurrence, Diet and Growth of Juvenile Blacktip Sharks,<i>Carcharhinus limbatus</i>, from Los Roques Archipelago National Park, Venezuela

Tavares, Rafael

doi:10.18475/cjos.v44i3.a4

Cited by 27 publications

(23 citation statements)

References 14 publications

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“…It could lead to increased availability of food and to reduced competition, and hence positively influence feeding efficiency, survivorship and growth of juvenile individuals (Werner et al 1983, Simpfendorfer & Milward 1993. A previous study conducted in Los Roques Archipelago reported a monospecific nursery for the blacktip shark (Tavares 2008), also revealing that juveniles of blacktip shark have a rapid growth and sexual maturation, compared with populations of the same species located in other regions of the Atlantic Ocean. Preliminary growth data of the lemon sharks from Los Gruber (1985), and Barker et al (2005) reported lower values of early growth rates i.e.…”

Section: Discussionmentioning

confidence: 99%

“…The M-type dart tag was typically used with adult sharks. To avoid injury and additional stress on captured juveniles, the dart head of the tag was inserted between the skin and the muscle through an incision with a surgical scalpel following Tavares (2008). The M-type and plastic dart tags were provided by the Cooperative Shark Tagging Program/National Marine Fisheries Service (USA), and the rototags with the contact information pointed by the Instituto Nacional de Investigaciones Agrícolas (Venezuela) were manufactured by ©Premier1Supplies (USA).…”

Section: Samplingmentioning

confidence: 99%

“…Previous studies carried out in this area revealed that the archipelago provides habitat for 21 species of sharks, with important nursery areas for the blacktip (Carcharhinus limbatus) and Caribbean reef (C. perezi) sharks (Tavares 2008(Tavares , 2009 suggest that tropical oceanic islands may be an efficient recruitment source for the recovery of shark populations. Due to the importance of nursery areas for sharks' life history, the characterization of these essential habitats becomes necessary to improve conservation and management plans.…”

Section: Introductionmentioning

confidence: 99%

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Nursery area and size structure of the lemon shark population, Negaprion brevirostris (Poey, 1868), in Los Roques Archipelago National Park, Venezuela

Tavares

Rodrı́guez

Morales³

2016

Univ. Sci.

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The protection of the habitats used by juvenile sharks is a management strategy that has recently caught the attention of fishery biologists. In the present study, we evaluated the population of the lemon shark (Negaprion brevirostris) from Los Roques Archipelago in order to identify the nursery area, describe the size composition, and examine the variation in nocturnal activity of the juvenile individuals. The data analysed came from three different sources: commercial shark fishery, tagrecapture sampling, and visual records. A total of 375 lemon sharks with total lengths between 55 and 281 cm were recorded during the study period. Overall data showed that the area occupied by juvenile lemon sharks was clearly partitioned into primary and secondary nurseries. Additionally, nighttime activity seemed to change according to the size of sharks in the primary nursery, suggesting a reduction of time activity overlapping among juveniles of distinct size/age. Results suggest that the strategy of utilization of the primary nurseries by the lemon shark may lead to important ecological benefits by reducing the competition, predation and natural mortality.

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Section: Discussionmentioning

confidence: 99%

Section: Samplingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nursery area and size structure of the lemon shark population, Negaprion brevirostris (Poey, 1868), in Los Roques Archipelago National Park, Venezuela

Tavares

Rodrı́guez

Morales³

2016

Univ. Sci.

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“…Según Gaitán y López (2008), esta especie alcanza la madurez sexual entre los 120 y 190 cm en las hembras, y entre 135 y 180 cm en los machos. A su vez, Branstetter (1987) reportó para el Atlántico Oeste una longitud total de madurez para C limbatus entre los 130-150 cm de longitud total, mientras que Tavares (2008) en Los Roques, venezuela reporta las menores longitudes total de adultos de individuos de C. limbatus 152 cm hasta los 161 cm. Para C. limbatus diferentes autores han reportado la utilización de bahías y bocas de ríos, donde incluso se han reportado para los juveniles algunas áreas de crianza, tal es el caso de Tavares (2008) quien reporta una para el Archipiélago Los Roques en venezuela.…”

Section: Discussionunclassified

“…Al igual que en otras zonas como en Los Roques y en el Atlántico Norte, en Bahía Wafer se analizó una misma proporción de hembras y machos del tiburón C. limbatus (Tavares, 2008;Branstetter, 1987). Por esta razón, se sugiere que las aguas turbias y arenosas de la bahía brindan alimentación y protección a las crías y juveniles de esta especie.…”

Section: Discussionunclassified

Poblaciones de tiburones en las bahías Chatham y Wafer del Parque Nacional Isla del Coco, Costa Rica

Zanella¹,

López-Garro²,

Martínez³

et al. 2016

RBT

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Shark populations in Chatham and Wafer bays, Isla del Coco National Park, Costa Rica. At least fourteen species of sharks live in the Marine Protected Area of Isla del Coco National Park (ICNP), some are resident species such as the whitetip reef shark (Triaenodon obesus); others are migratory and visit the National Park throughout the year, e.g. the scalloped hammerhead shark (Sphyrna lewini) and the whale shark (Rhincodon typus). Between March 2010 and August 2012 six expeditions out to the ICNP were carried, during this period 25 night trips (from 18:00 to 22:00 hr) for shark tagging were conducted in the Wafer and Chatham bays. During those trips, 185 sharks were analyzed: 81.1 % were whitetip reef sharks (T. obesus), 16.7 % were blacktip sharks (Carcharhinus limbatus), 1.1 % were blacktip reef sharks (Carcharhinus melanopterus) and 1.1% were silvertip sharks (Carcharhinus albimarginatus). The most common species in Bahía Chatham was T. obesus, while the most common one in Bahía Wafer was C. limbatus, which represented 80.9 % and 80.5 % of the total sharks caught, respectively. Regarding T. obesus, a sex ratio of 1.2 males per female was estimated (X 2 =0.09; p=0.17); in turn a sex ratio of 1.01 males per female was observed (X 2 =0.04; p=0.79) for C. limbatus. The average total length for T. obesus and C. limbatus was 103.66±13.91 cm and 76.58±14.56 cm respectively; suggesting that black tip sharks use those bays during immature stages. The results show an interspecific spatial segregation of the most common resident sharks at ICNP, apparently the clear waters and the coral cover of Chatham Bay are preferred by T. obesus; while the turbid waters of the Genio River mouth are preferred by C. limbatus. Rev. Biol. Trop. 64 (Suppl. 1): S177-S186. Epub 2016 February 01.

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Factors shaping the co-occurrence of two juvenile shark species along the Texas Gulf Coast

et al. 2017

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Occurrence, Diet and Growth of Juvenile Blacktip Sharks,Carcharhinus limbatus, from Los Roques Archipelago National Park, Venezuela

Cited by 27 publications

References 14 publications

Nursery area and size structure of the lemon shark population, Negaprion brevirostris (Poey, 1868), in Los Roques Archipelago National Park, Venezuela

Nursery area and size structure of the lemon shark population, Negaprion brevirostris (Poey, 1868), in Los Roques Archipelago National Park, Venezuela

Poblaciones de tiburones en las bahías Chatham y Wafer del Parque Nacional Isla del Coco, Costa Rica

Factors shaping the co-occurrence of two juvenile shark species along the Texas Gulf Coast

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