Dinâmica de populações e pesca do tubarão-martelo Sphyrna lewini (Griffith &amp; Smith, 1834), capturado no mar territorial e zona econômica exclusiva do sudeste-sul do Brasil

Kotas, Jorge Eduardo; Júnior, Miguel Petrere

doi:10.11606/t.18.2004.tde-08122015-105215

Cited by 16 publications

(41 citation statements)

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“…Schwartz (1983), with whole vertebrae in the eastern USA coast and Andrade and Mazzoleni (1999) with vertebrae cuts from southern Brazilian scalloped hammerheads also obtained evidence of annual ring formation. The birth ring appears in pups during the spring-summer season, a reproductive period previously described by other authors (Vooren and Klippel, 2005;Kotas, 2004). Birth rings are formed as a response of the stress caused by changing placental viviparity to free-living lifestyle.…”

Section: Discussionmentioning

confidence: 66%

“…Marginal increments were significantly different among months (Kruskal-Wallis c 2 = 18.6; p = 0.017). However, in a previous study carried out by Kotas (2004) who compared the percentual of opaque and hyaline bands found per month, ageing the whole vertebrae of Sphyrna lewini (n = 361), the highest frequency of hyaline bands was observed in winter (Table 2). Also the same author applying marginal increment analysis (MIA) to 260 vertebrae samples, found lower values in winter.…”

Section: Resultsmentioning

confidence: 91%

“…Scalloped hammerheads, Sphyrna lewini, were sampled (n = 245) from landings between 1995 and 2002 (Kotas, 2004) in Ubatuba (São Paulo state) and Itajaí (Santa Catarina state). Fishing in these regions was conducted with surface and bottom gillnetters, surface longliners and bottom trawlers (pair and double-rig).…”

Section: Methodsmentioning

confidence: 99%

“…Shark total length (TL) and the distance between the first dorsal insertion and the precaudal pit (DC) were measured. This later measurement was used, during harbour sampling, to transform shark carcasses in total length (TL), using the following morphometric relationship: TL = 9.125 + 2.7 (DC) (Kotas, 2004).…”

Section: Methodsmentioning

confidence: 99%

“…In developing theoretical growth models, an arbitrary birth date of 1 January, the approximate mid-point of the time-period when neonates were present in the field were adopted (Kotas, 2004). It was also considered that the birth mark is the band associated with a pronounced change in angle in the intermedialia, and that the translucent bands that represent winter growth form approximately one year later.…”

Section: Methodsmentioning

confidence: 99%

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Age and growth of the Scalloped Hammerhead shark, Sphyrna lewini (Griffith and Smith, 1834), from the southern Brazilian coast

Kotas¹,

Mastrochirico

Petrere

2011

Braz. J. Biol.

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Age and growth studies for the scalloped hammerhead shark, Sphyrna lewini (Griffith and Smith, 1834) caught along the southern Brazilian coast, were based on ring measurements of vertebrae sections of 115 males, 116 females and 14 unknown sexed sharks between 48 and 344 cm total length (TL). The von Bertalanffy growth models were best fit using back-calculated data. The growth parameters obtained for males, were L ∞ = 266 cm; K = 0.05/year; L 0 = 47 cm. For females, L ∞ = 300 cm; K = 0.05/year; L 0 = 51 cm. An adult female reached 217 cm TL and was 31.5 years old. On the other hand, an adult male was 29.5 years old and measured 234 cm TL. Longevity estimate for males and females was 55 years. Therefore, S. lewini is a long-lived fish. Ageing precision, based on the IAPE index, was 5.6%. Marginal Increment analysis based on MIR index from hammerheads smaller than 105 cm, compared with the percentual of opaque and hyaline bands found per month ageing whole vertebrae, showed an annual ring formation, i.e., in winter.Keywords: elasmobranchs, fisheries biology, conservation.Idade e crescimento do tubarão-martelo-entalhado, Sphyrna lewini (Griffith and Smith, 1834), da costa sul do Brasil ResumoO estudo da idade e do crescimento do tubarão-martelo-entalhado, Sphyrna lewini (Griffith and Smith, 1834), na costa sul do Brasil, baseou-se na leitura de anéis em seções de vértebras de 115 machos, 116 fêmeas e de 14 exemplares com sexo indeterminado, com comprimentos totais (CT) entre 48 e 344 cm. Modelos de crescimento de von Bertalanffy foram mais bem ajustados aos dados de idade e comprimento retrocalculados, considerando sexos em separado. Os parâmetros de crescimento obtidos para os machos foram L ∞ = 266 cm; K = 0,05/ano; L 0 = 47 cm. Para as fêmeas L ∞ = 300 cm; K = 0,05/ano; L 0 = 51 cm. Uma fêmea adulta atingiu um CT de 217 cm e uma idade de 31,5 anos. Por sua vez, um macho adulto tinha 29,5 anos e CT de 234 cm. A estimativa de longevidade para machos e fêmeas foi de 55 anos. O índice de erro percentual médio (IAPE), que avalia a precisão na leitura de idades, foi de 5,6%. A análise do incremento marginal baseada no índice MIR e aplicada em tubarões com CT < 105 cm, comparada com o percentual de bandas opacas e hialinas mensais, obtido através de leituras de vértebras inteiras, indicou um padrão anual na formação dos anéis, ou seja, anéis de inverno.Palavras-chave: elasmobrânquios, biologia pesqueira, conservação.

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Section: Discussionmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Age and growth of the Scalloped Hammerhead shark, Sphyrna lewini (Griffith and Smith, 1834), from the southern Brazilian coast

Kotas¹,

Mastrochirico

Petrere

2011

Braz. J. Biol.

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>b<Anatomia do Bulbo olfatório em >i<Sphyrna lewini>/i< juvenil (GRIFFITH & SMITH, 1834):>/b< (tubarão-martelo) (Elasmobranchii: Carchahinidae)

Silva¹

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The hammerhead shark Sphyrna lewini (GRIFFITH & SMITH, 1834) is a cosmopolitan species of coastal and oceanic habits belonging to the order Carcharhiniformes. The head, compressed dorso-ventrally and laterally expanded in a cephalofoil, correspond to a morphological peculiarity in relation to the other species, resulting in large olfactory organs. Given the peculiar morphology of the head and the relevant potential of the hammerhead shark for navigation in two distinct marine environments, we postulate that this particularity may be reflected in the architecture of the olfactory bulb and the peripheral olfactory organ (the olfactory rosette) as an olfactory adaptation of this species to its habitat. Therefore, this work examined these structures by light microscopy (LM) and scanning electron microscopy (SEM). The olfactory bulbs are macroscopically long and cohesive, with no swellings or subdivisions. Histological analyzes showed a conjunctive peripheral layer, a glomerular layer and a layer of nerve bundles supported by an extensive mass of mitral cells. Olfactory rosettes consist of a number of lamellae (not determined) covered by sensory olfactory epithelium arranged in a column, composed of large and elongated receptor neurons that present microvilli in the apical region, rounded basal cells and a basal lamina of support. Although the structures that make up the olfactory system of the Sphyrna lewini are large macroscopically and with greater sensory epithelial surface area, there is no direct evidence correlating the size of these structures to the olfactory sensitivity.

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A atividade pesqueira na represa do Lobo-Broa (Itirapina, Brotas-SP): caracterização e composição da captura

Pereira¹

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Dinâmica de populações e pesca do tubarão-martelo Sphyrna lewini (Griffith & Smith, 1834), capturado no mar territorial e zona econômica exclusiva do sudeste-sul do Brasil

Cited by 16 publications

References 0 publications

Age and growth of the Scalloped Hammerhead shark, Sphyrna lewini (Griffith and Smith, 1834), from the southern Brazilian coast

Age and growth of the Scalloped Hammerhead shark, Sphyrna lewini (Griffith and Smith, 1834), from the southern Brazilian coast

>b<Anatomia do Bulbo olfatório em >i<Sphyrna lewini>/i< juvenil (GRIFFITH & SMITH, 1834):>/b< (tubarão-martelo) (Elasmobranchii: Carchahinidae)

A atividade pesqueira na represa do Lobo-Broa (Itirapina, Brotas-SP): caracterização e composição da captura

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