Length at maturity of the greeneye spurdog shark, Squalus mitsukurii (Elasmobranchii : Squalidae), from the SW Atlantic, with comparisons with other regions

Lucifora, Luis O.; Valero, Juan L.; García, Verónica B.

doi:10.1071/mf98167

Cited by 66 publications

(52 citation statements)

References 7 publications

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“…These differences may be attributable to differences in the methods for assessing maturity and/or in sample size used in each study. Another possible explanation, taking into account that C. callorynchus has a widely distribution off southern South America, is that perhaps there are multiple discrete populations of this species with latitudinal variation in size at maturity, as was suggested for several chondrichthyan species around the world (Templeman, 1987;Parsons, 1993;Lucifora et al, 1999;Chiaramonte, Petovello, 2000;Mabragaña, Cousseau, 2004;Colonello et al, 2007;Ebert et al, 2008;Barnett et al, 2009). In turn, the PCL 50 estimated in the study area was lower than those values found in northern Patagonian waters, which may be associated with the fact that coastal waters of south-eastern Buenos Aires Province support the highest pressure on chondrichthyans in Argentina (Massa et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Reproductive biology of the cockfish, Callorhinchus callorynchus (Chondrichthyes: Callorhinchidae), in coastal waters of the northern Argentinean Sea

et al. 2017

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The cockfish, Callorhinchus callorynchus, is a widely distributed holocephalan in the south-western Atlantic and an important resource for Argentinean fisheries. The reproductive characteristics of this species were studied in northern Argentinean coastal waters, where specimens arrive seasonally (winter-spring). Sexual dimorphism in maximum precaudal length (PCL) and total body mass (TM) was found, being females (PCL=630 mm; TM=3330 g; n=167) larger and heavier than males (PCL=482 mm; TM=1630 g; n=19). Maturity size for females was 466.22 mm PCL, representing 74% PCL of the largest female sampled. The mean number of ovarian follicles was 8.37 (± 4.84). The highest values of ovarian follicles diameter, gonadosomatic and oviducalsomatic indices were found in spring. A high proportion of mature females (44%) had atretic ovarian follicles, suggesting that they were in the resting stage of their reproductive cycle. The low number of mature males recorded and the absence of mature females with spermatophore masses or egg cases indicate that the study area would not be a reproductive zone. The seasonal presence of C. callorynchus in this region could be related to trophic movements. These results, obtained in an area with high fishing pressure on chondrichthyans, will be useful for implementing conservation and management measures.Keywords: Holocephalans, Maturity, Ovarian fecundity, Seasonality, South-western Atlantic.El pez gallo, Callorhinchus callorynchus, es un holocéfalo con amplia distribución en el Atlántico Sudoccidental y un recurso importante para las pesquerías en Argentina. Las características reproductivas de esta especie fueron estudiadas en aguas costeras al norte del Mar Argentino, adonde se acercan estacionalmente (invierno-primavera). Se observó dimorfismo sexual en los valores máximos de longitud precaudal (LPC) y masa corporal total (MT), siendo las hembras (LPC=630 mm; MT=3330 g; n=167) más grandes y pesadas que los machos (LPC=482 mm; MT=1630 g; n=19). La talla de maduración para las hembras fue de 466,22 mm LPC, representando el 74% de la LPC máxima observada. El número promedio de folículos ováricos fue 8,37 (± 4,84). Los valores más altos del diámetro de los folículos ováricos, índice de la glándula oviductal e índice gonadosomático fueron hallados durante primavera. Una gran proporción de hembras maduras (44%) presentaron folículos ováricos atrésicos, sugiriendo que se encontraban en la etapa de reposo de su ciclo reproductivo. El bajo número de machos maduros registrados y la ausencia de hembras maduras con espermatóforos o cápsulas de huevos indican que las aguas costeras del norte de Argentina no serían una zona reproductiva. La presencia de C. callorynchus en el área de estudio podría estar relacionada con movimientos tróficos. Los resultados, obtenidos en un área con una gran presión pesquera sobre los condrictios, serán útiles para implementar adecuados planes de manejo y conservación de esta especie.

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Section: Discussionmentioning

confidence: 99%

Reproductive biology of the cockfish, Callorhinchus callorynchus (Chondrichthyes: Callorhinchidae), in coastal waters of the northern Argentinean Sea

et al. 2017

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“…The size at sexual maturity is of special interest in fisheries management, which is widely used as an indicator for minimum permissible capture size (Lucifora et al, 1999). Available information on size at sexual maturity of fishes can be obtained from the plots of percentage occurrence of mature females against length class using logistic equation (King, 2007), though few studies (Gab-Alla et al, 1990;Hossain et al, 2012a) have reported low accuracy of estimating size at sexual maturity using logistic equation.…”

Section: Discussionmentioning

confidence: 99%

Size at Sexual Maturity of the Female Pool Barb, Puntius sophore (Cyprinidae) in the Old Brahmaputra River, North Eastern Bangladesh

Ahamed¹,

Ahmed²,

Hossain³

et al. 2015

Ecologia

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The size at sexual maturity of the female Puntius sophore was estimated in the Old Brahmaputra river, North eastern Bangladesh, using direct observation of sexual characters (e.g., gonadosomatic index) and by the indirect way using relative growth. Monthly samples were collected using a combination of fine-meshed cast nets and seine nets. All specimens were sexed and Standard Length (SL), Fork Length (FL), Body Weight (BW) and Gonadal Weight (GW) of all female individuals was measured. The gonadosomatic index (GSI) was calculated as GSI = (GW/BW×100). The size at sexual maturity was estimated by the relationships of SL-GSI and SL-FL. The estimated size at sexual maturity of female P. sophore was 4.2 cm standard length based on the relationship between standard length and gonadosomatic index. On the other hand, relative growth of fork length to standard length showed a transition point at sizes 4 cm standard length, indicating size at sexual maturity of female P. sophore. This study presents information on the size at sexual maturity of female P. sophore, which will be useful for the management and conservation of this important fishery in Bangladesh and neighboring countries.

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“…Tormosoval (1983) density, food, and water temperature might influence the growth of fish and further affect their size at first maturity. As the parameter is useful for endangered species management, this information can be used to suggest mesh sizes for conservation measures to be adopted by fishery administrators to avoid overfishing (Lucifora et al, 1999). The size and number of eggs and larvae produced by individual fish are determined by the predictability of survival and trade-offs in energy allocation to reproduction, growth, behavior and maintenance (Smith and Fretwell, 1974;Roff, 2000).…”

Section: Discussionmentioning

confidence: 99%

Reproductive biology of Chinese minnow Hemiculterella sauvagei Warpachowski, 1888 in the Chishui River, China

et al. 2013

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SummaryThis study describes the reproductive biology of the Chinese minnow Hemiculterella sauvagei. The length-weight relationship, sex ratio, spawning season, size at first maturity, and fecundity were analyzed based on 685 specimens collected from the Chishui River between July 2011 and July 2012. The relationship between standard length (SL) and body weight (BW) were estimated as BW = 2.14 9 10 À4 9 SL 2.801(R 2 = 0.839; N = 413; P < 0.05) for females and BW = 1.31 9 10 À4 9 SL 3.001 (R 2 = 0.868; N = 272; P < 0.05) for males. The female to male sex ratio, 1.52 : 1, differed significantly from a 1 : 1 ratio. Females predominated in standard lengths >12 cm. Analyses of the monthly variation in the gonadosomatic index (GSI), the monthly proportions of macroscopic gonadal maturity, and the size distribution of oocytes consistently suggested a prolonged spawning season of H. sauvagei from March to August, with a peak from April to May. Logistic curves describing the relationship between proportion of maturity (P r ) at each length interval and standard length were estimated as P r = 1/(1 + e 26.867-0.306SL ) (R 2 = 0.999; N = 413; P < 0.05) for females and P r = 1/ (1 + e 10.522-0.142SL ) (R 2 = 0.999; N = 272; P < 0.05) for males. Size at first maturity was estimated as 7.4 cm for males and 8.8 cm SL for females. Absolute fecundity varied from 563 to 5052, with a mean of 2413 AE 874 oocytes per ovary. The relative fecundity was estimated to be 41-299, with a mean of 171 AE 55 oocytes per ovary. The present study provides useful information for fishery management and resources conservation.

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Length at maturity of the greeneye spurdog shark, Squalus mitsukurii (Elasmobranchii : Squalidae), from the SW Atlantic, with comparisons with other regions

Cited by 66 publications

References 7 publications

Reproductive biology of the cockfish, Callorhinchus callorynchus (Chondrichthyes: Callorhinchidae), in coastal waters of the northern Argentinean Sea

Reproductive biology of the cockfish, Callorhinchus callorynchus (Chondrichthyes: Callorhinchidae), in coastal waters of the northern Argentinean Sea

Size at Sexual Maturity of the Female Pool Barb, Puntius sophore (Cyprinidae) in the Old Brahmaputra River, North Eastern Bangladesh

Reproductive biology of Chinese minnow Hemiculterella sauvagei Warpachowski, 1888 in the Chishui River, China

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