New features on spatial distribution, age and growth of the protected species Totoaba macdonaldi in the Gulf of California

Palabras clave: Distribución, edad, crecimiento individual, crecimiento isométrico, proporción de sexos, Totoaba macdonaldi

Resumen

To assess some demographic aspects of Totoaba macdonaldi 40 years after commercial exploitation was banned, from April 2010 to July 2014, sampling trips in the Gulf of California were performed to determine the spatial distribution, age structure, growth, length-weight relationship, and sex ratio. Based on otolith growth ring detection, fish age comprised from 0 to 19 years. Two recruitment areas were identified; 1) Las Encantadas islands, close to Bahía San Luis Gonzaga, and 2) Piedra Consag, off the coast of San Felipe, Baja California. Totoaba catches in Bahía de La Paz, Baja California Sur, and Mazatlán, Sinaloa, suggest a new record that broadens its historical range. Based on a Bayesian approach, the von Bertalanffy growth parameters were estimated for the population as a whole, and separated by females and males with rates of 0.27, 0.28 and 0.31year-1, respectively. The length-weight relationship obtained suggests isometric growth. The sex ratio showed no significant differences (p > 0.05) from the expected 1:1 ratio. The expansion of the distribution range and the age structure observed until the year 2013-2014 may be considered at least of population stability. Now, it is necessary to carry out new research to evaluate the present condition of the population.

Biografía del autor/a

Oswaldo Uriel Rodríguez-García, Centro de Investigaciones Biológicas del Noroeste, S.C.
Programa de Posgrado
Martha Judith Román-Rodríguez, Comisión de Ecología y Desarrollo Sustentable del Estado de Sonora
Investigadora
Enrique Morales-Bojorquez, Centro de Investigaciones Biológicas del Noroeste, S.C.

Programa de Ecología Pesquera

Investigador Titular

Juan Antonio De Anda Montañez, Centro de Investigaciones Biológicas del Noroeste, S.C.

Programa de Ecología Pesquera

Investigador titular

Francisco Javier García-De León, Centro de Investigaciones Biológicas del Noroeste, S.C.
Programa de Planeación Ambiental y Conservación
Lucia Campos-Dávila, Centro de Investigaciones Biológicas del Noroeste, S.C.

Programa de Ecología Pesquera

 

Horacio Bervera-León, Centro de Investigaciones Biológicas del Noroeste, S.C.
Programa de Ecología Pesquera
Laura Beatriz Rivera-Rodríguez, Universidad Autónoma de Sinaloa
Facultad de Ciencias del Mar
Publicado
2020-09-21
Sección
Artículos