Age Assessment of the Lemon Shark, Negaprion brevirostris, Using Tetracycline Validated Vertebral Centra

Brown, Craig; Gruber, Samuel H.

doi:10.2307/1445397

Cited by 115 publications

(96 citation statements)

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“…Because lemon sharks have relatively few young (up to 18 biennially) and grow slowly in comparison with many species of sharks, adequate survival is imperative for stable populations (Brown & Gruber 1988. Even with a high degree of site fidelity and movements largely restricted to shallow water, lemon sharks suffer a high natural mortality, with estimates of annual mortality at Bimini between 40 and 50% in the first year (Manire & Gruber 1993.…”

Section: Discussionmentioning

confidence: 99%

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Movement patterns of juvenile lemon sharks Negaprion brevirostris within Atol das Rocas, Brazil: a nursery characterized by tidal extremes

Wetherbee¹,

Gruber²,

Rosa³

2007

Mar. Ecol. Prog. Ser.

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Movement patterns and habitat use of juvenile lemon sharks Negaprion brevirostris were monitored at Atol das Rocas, Brazil, an atypical nursery area for this species, characterized by extreme tides and a lack of seagrass flats and mangroves. Twenty-three sharks carrying transmitters were monitored using an array of bottom-fixed automated receivers during 3 trips over a total of 60 d. Transmitters were recorded on receivers over 13 000 times, and the majority of sharks were detected more than 100 times. Newborn sharks (60 to 80 cm total length, TL) showed restricted but repeated movements between small tide pools on reef flats at low tide and a small, shallow, nearby tidal creek at high tide. Larger sharks (up to 106 cm TL) sampled 6 and 20 mo after the study in March 2000 frequented the tidal creek and several other locations at high tide and a variety of larger pools at low tide, and in general exhibited more extensive movements within the atoll than did newborn sharks. Sharks approaching 2 yr of age were generally observed in specific pools or shallow water locations within the atoll during high and low tides, but also expanded their movements to include more of the atoll. Throughout the study, young lemon sharks appeared to concentrate movements within shallow-water low-tide refuges and separate high tidal areas. Movement patterns of sharks in Atol das Rocas differ from those at other well-studied lemon shark nursery locations, where individuals continuously occupy shallow flats and mangrove habitats. Nevertheless, lemon sharks in general restrict their movements to shallow-water habitats regardless of the specific nursery area occupied. This behavior is most likely related to predator avoidance. This study provides an example of the interaction between the physical environment and the biology of animals -in this case, the influence of the physical characteristics of a nursery area and the behavioral ecology of young lemon sharks. KEY WORDS: Shark nurseries · Tidal fluctuation · Refuging · Movement patterns · Predator avoidanceResale or republication not permitted without written consent of the publisher

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Section: Discussionmentioning

confidence: 99%

“…In November 2001, sharks were even less concentrated in central locations and were caught at a variety of locations. During this trip, larger sharks were captured and all but one shark were presumed to be nearing 2 yr of age (Brown & Gruber 1988).…”

Section: Methodsmentioning

confidence: 99%

Movement patterns of juvenile lemon sharks Negaprion brevirostris within Atol das Rocas, Brazil: a nursery characterized by tidal extremes

Wetherbee¹,

Gruber²,

Rosa³

2007

Mar. Ecol. Prog. Ser.

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“…In contrast, large tropical Carcharhiniformes (.2000 mm e.g. C. leucas, N. brevirostris) typically conform to the slow-growing, long-lived paradigm more frequently associated with elasmobranchs (Brown and Gruber 1988;Neer et al 2005). These similarities also extend to habitat and spatial usage.…”

Section: Risk Mitigation Strategies In Multispecies Tropical Shark Fmentioning

confidence: 99%

Evaluating catch and mitigating risk in a multispecies, tropical, inshore shark fishery within the Great Barrier Reef World Heritage Area

Harry¹,

Tobin²,

Simpfendorfer³

et al. 2011

Mar. Freshwater Res.

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Abstract. Small-scale and artisanal fisheries for sharks exist in most inshore, tropical regions of the world. Although often important in terms of food security, their low value and inherent complexity provides an imposing hurdle to sustainable management. An observer survey of a small-scale commercial gill-net fishery operating within the Great Barrier Reef World Heritage area revealed at least 38 species of elasmobranch were present in the catch. Of the total elasmobranch catch, 95% was 25 species of Carcharhiniformes from the families Carcharhinidae, Hemigaleidae and Sphyrnidae. Individual species were captured in a variety of ways by the fishery, often with strongly biased sex ratios and in a variety of life stages (e.g. neonates, juveniles, adult). Despite this, the main carcharhiniform taxa captured could be qualitatively categorised into four groups based on similar catch characteristics, body size and similarities in life history: small coastal (,1000 mm); medium coastal (1000-2000 mm); large coastal/semi-pelagic (.2000 mm); and hammerheads. Such groupings can potentially be useful for simplifying management of complex multispecies fisheries. The idiosyncrasies of elasmobranch populations and how fisheries interact with them provide a challenge for management but, if properly understood, potentially offer underutilised options for designing management strategies.

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“…For rays, disc width was measured. Maturity of sharks and rays was determined by macroscopic examination of gonads, examination of claspers and siphon sacs on male specimens, or by comparison of shark size with published species-specific size-at-maturity estimates (Brown and Gruber, 1988;Snelson et al, 1988;Natanson et al, 2014;Frazier et al, 2014).…”

Section: Species and Life-history Stagesmentioning

confidence: 99%

“…However, since all bull sharks in the present study were estimated to be younger than $ 3 years, all animals were immature. For lemon sharks, Von Bertalanffy growth curves (with precaudal lengths instead of total lengths) and ages at maturity as reported by Brown and Gruber (1988) were used. All lemon sharks analyzed in the current study were younger than these reported ages at maturity so all lemon sharks were immature.…”

Section: Species and Life-history Stagesmentioning

confidence: 99%

Bioaccumulation of organohalogenated compounds in sharks and rays from the southeastern USA

Weijs

Briels

Adams

et al. 2015

Environmental Research

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a b s t r a c tOrganohalogenated compounds are widespread in the marine environment and can be a serious threat to organisms in all levels of aquatic food webs, including elasmobranch species. Information about the concentrations of POPs (persistent organic pollutants) and of MeO-PBDEs (methoxylated polybrominated diphenyl ethers) in elasmobranchs is scarce and potential toxic effects are poorly understood. The aims of the present study were therefore to investigate the occurrence of multiple POP classes (PCBs, PBDEs, DDXs, HCB, CHLs) and of MeO-PBDEs in various elasmobranch species from different trophic levels in estuarine and marine waters of the southeastern United States. Overall, levels and patterns of PCBs, PBDEs, DDXs, HCB, CHLs and of MeO-PBDEs varied according to the species, maturity stage, gender and habitat type. The lowest levels of POPs were found in Atlantic stingrays and the highest levels were found in bull sharks. As both species are respectively near the bottom and at top of the trophic web, with juvenile bull sharks frequently feeding on Atlantic stingrays, these findings further suggest a bioaccumulation and biomagnification process with trophic position. MeO-PBDEs were not detected in Atlantic stingrays, but were found in all shark species. HCB was not found in Atlantic stingrays, bonnetheads or lemon sharks, but was detected in the majority of bull sharks examined. Comparison with previous studies suggests that Atlantic stingrays may be experiencing toxic effects of PCBs and DDXs on their immune system. However, the effect of these compounds on the health of shark species remains unclear.

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Age Assessment of the Lemon Shark, Negaprion brevirostris, Using Tetracycline Validated Vertebral Centra

Cited by 115 publications

References 11 publications

Movement patterns of juvenile lemon sharks Negaprion brevirostris within Atol das Rocas, Brazil: a nursery characterized by tidal extremes

Movement patterns of juvenile lemon sharks Negaprion brevirostris within Atol das Rocas, Brazil: a nursery characterized by tidal extremes

Evaluating catch and mitigating risk in a multispecies, tropical, inshore shark fishery within the Great Barrier Reef World Heritage Area

Bioaccumulation of organohalogenated compounds in sharks and rays from the southeastern USA

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