Size at maturity of the Pacific sharpnose shark Rhizoprionodon longurio in the Gulf of California, Mexico

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D Corro-Espinosa
JF Márquez-Farías
AF Muhlia-Melo

Abstract

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.

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How to Cite
Corro-Espinosa, D., Márquez-Farías, J., & Muhlia-Melo, A. (2011). Size at maturity of the Pacific sharpnose shark Rhizoprionodon longurio in the Gulf of California, Mexico. Ciencias Marinas, 37(2), 201–214. https://doi.org/10.7773/cm.v37i2.1934
Section
Research Article
Author Biographies

D Corro-Espinosa, Centro Regional de Investigaciones Pesqueras de Mazatlán, Instituto Nacional de Pesca

Programa Tiburón, CRIP-Mazatlá, Investigador Titular C

JF Márquez-Farías, Universidad Autónoma de Sinaloa

Facultad de Ciencias del Mar, UAS

AF Muhlia-Melo, Centro de Investigaciones Biológicas del Noroeste

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