Size at maturity of the Pacific sharpnose shark Rhizoprionodon longurio in the Gulf of California, Mexico
Fuente:
Redalyc · Ciencias Marinas
We report on the proportion of maturity stages as a function of size of the Pacific sharpnose shark Rhizoprionodon longurio. Based on the development of internal and external organs, males and females were classified as immature or mature. A logistic model was fitted to develop a maturity curve to e...
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| Published in: | Ciencias Marinas |
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| Main Author: | |
| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad Autónoma de Baja California
2011
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| Summary: | We report on the proportion of maturity stages as a function of size of the Pacific sharpnose shark Rhizoprionodon longurio. Based on the development of internal and external organs, males and females were classified as immature or mature. A logistic model was fitted to develop a maturity curve to estimate the length at which 50% of the individuals are mature (L50%). This species has an annual reproductive cycle and its birthing season is from April to July, with June as the main month. For males, L50% = 100.61 cm total length (TL) and Φ = 2.57, and for females, L50% = 92.9 cm TL and Φ = 1.08. For pregnant females, L50% = 106.4 cm TL and Φ = 6.11. The maturity curves obtained in the present study can be used in demographic studies to produce more accurate forecasts of the population reproductive rate and thus develop fishery management measures for this species.
Se presenta información sobre la proporción de estadios de madurez del tiburón bironche Rhizoprionodon longurio en función de la longitud. Con base en el desarrollo de los órganos internos y externos, los machos y las hembras se clasificaron como inmaduros y maduros. Se ajustó un modelo logístico para obtener la curva de madurez sexual y estimar la longitud a la cual el 50% de los individuos alcanzó la madurez sexual ( L50%). La especie se reproduce anualmente y la temporada de nacimiento es de abril a julio, siendo junio el mes principal. Para machos, L50% = 100.61 cm longitud total (LT) y Φ = 2.57, y para hembras, L50% = 92.9 cm LT y Φ = 1.08. Para las hembras preñadas, L50% = 106.4 cm LT y Φ = 6.11. Las curvas de madurez obtenidas en el presente estudio pueden usarse en estudios demográficos para obtener pronósticos más precisos de la tasa reproductiva poblacional que permitan recomendar medidas de manejo pesquero para esta especie. |
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