The biology of the finetooth shark,Carcharhinus isodon

Castro, José Ignacio Fernández del

doi:10.1007/bf00001717

Cited by 53 publications

(51 citation statements)

References 7 publications

(9 reference statements)

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“…Various hypotheses have been proposed to explain the phenomenon, such as sexual differences in reproductive strategies (Sims, 2005) and physiological requirements (Wearmouth and Sims, 2008); that are related to sexual maturity. Moreover, reproductive events of mating, gestation and parturition directly influence the physiological condition (King, 1984), migration (Bansemer and Bennett, 2009) and habitat use (Castro, 1993;Heupel et al, 2007) at seasonal or annual scales. Therefore, both the size-at-maturity and the seasonality of reproductive events must be known to understand the spatio-temporal pattern of distribution and behaviour of sharks throughout their lifetime.…”

Section: Discussionmentioning

confidence: 99%

Insights into the reproductive biology and fisheries of two commercially exploited species, shortfin mako (Isurus oxyrinchus) and blue shark (Prionace glauca), in the south-east Pacific Ocean

Bustamante

Bennett

2013

Fisheries Research

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Section: Discussionmentioning

confidence: 99%

Insights into the reproductive biology and fisheries of two commercially exploited species, shortfin mako (Isurus oxyrinchus) and blue shark (Prionace glauca), in the south-east Pacific Ocean

Bustamante

Bennett

2013

Fisheries Research

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“…Castro (1993) published descriptive diet data for the finetooth shark in the northwest Atlantic off the coasts of South Carolina and Daytona Beach, Florida, and found teleosts (Brevoortia tyrannus, Leiostomus xanthurus, Scom- beromorus maculatus, and Mugil sp.) to be the primary prey.…”

Section: Feeding Habitsmentioning

confidence: 99%

Foraging ecology of the early life stages of four sympatric shark species

Bethea¹,

Buckel²,

Carlson³

2004

Mar. Ecol. Prog. Ser.

152

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Sharks may have an important role in marine ecosystems in relation to populations of fish and invertebrates at lower trophic levels. Fishery management plans stress the need for an ecosystem approach, but few quantitative studies on the foraging ecology of sharks have been published. Stomach contents and catch data of early life stages of Atlantic sharpnose Rhizoprionodon terraenovae, blacktip Carcharhinus limbatus, finetooth Carcharhinus isodon, and spinner sharks Carcharhinus brevipinna taken from fishery independent surveys in Apalachicola Bay, Florida, USA, were examined to test for overlap in resource use. Young-of-the-year Atlantic sharpnose sharks were found to feed mainly on shrimp, juveniles on sciaenids, and adults on clupeids. Young-of-the-year blacktip sharks were found to feed mainly on sciaenids, whereas juveniles fed on clupeids. The primary prey of young-of-the-year and juvenile finetooth and spinner sharks was clupeids. Eight of 10 prey size-selectivity tests showed neutral selection. Compared to relative prey sizes published for teleost piscivores, Atlantic sharpnose and finetooth sharks consume relatively small-sized prey while blacktip sharks consume relatively large prey. Regardless of maturity state and species, diet overlap was high for species-life stage combinations that are similar in size; however, species-life stages did not show significant habitat overlap. Prey categories shared by similar-sized species may not be limiting, although shark species may have alleviated competition pressure by partitioning the resource of time or space.

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“…Researchers have speculated that this short opportunistic window evolved to maximize the reproductive success of these species by increasing the survival of the young (Castro 2009). Despite the general acceptance of this view of carcharhinid reproductive strategy, the information on which it is based has been obtained from only a few species, largely ones from the temperate waters of the western North Atlantic Ocean, including the Atlantic Sharpnose Shark (Parsons 1983;Loefer and Sedberry 2003), Blacktip Shark Carcharhinus limbatus (Castro 1996), Finetooth Shark (Castro 1993), Blacknose Shark (Driggers et al 2004;Sulikowski et al 2007), Sandbar Shark C. plumbeus (Baremore and Hale 2012), and Bonnethead Sphyrna tiburo (Parsons 1993). In addition, several of these studies have lacked sample sizes and intervals adequate to fully assess the potential reproductive patterns and/or anomalies that could exist within a population.…”

Section: Discussionmentioning

confidence: 99%