Notas sobre la biología del tiburón mamona <i>Mustelus lunulatus</i> (Carcharhiniformes: Triakidae) en el Pacífico Central ecuatoriano

Abstract

Mustelus lunulatus is the most important shark demersal species in the landings of the Ecuadorian artisanal fishery, this study was carried out to expand the knowledge about size, sex, type of growth (isometric or allometric) and reproductive aspects in males of the species. Biological traits of the sicklefin smooth-hound shark, M. lunulatus, caught in the Pacific coast of Ecuador were assessed by examining 199 individuals ranging from 41.2 to 135.0 cm in total length (TL). The means TL did not show significant differences between sexes. The sex ratio was not different from 1:1 and the weightlength relationship did not showed significant differences between males and females. Both sexes have a growth of isometric type (b males = 3.05 and b females = 3.15). Total length at sexual maturity (TL 50) of male M. lunulatus, calculated from the clasper condition, was estimated to be 97.2 cm. The present study provides new information regarding the biology of M. lunulatus in Ecuadorian waters.

Catch Composition, Seasonality and Biological Aspects of Sharks Caught in the Ecuadorian Pacific

“…Females were significantly more abundant than males, disagreeing with what was documented in the Colombian [100] and Ecuadorian [101], where the sexual proportion was no different from parity. The length at maturity for males of this work (95.93 cm TL) was similar to that reported in the Gulf of California (91.5 cm TL) [102] and in the Ecuadorian Pacific (97.2 cm TL) [101]. 75% of the males examined were immature.…”

“…As for females, 82% had not reached sexual maturity, according to the maturity size estimated by Pérez-Jiménez and Sosa-nishizaki (103.2 cm TL) [102]. These results coincide with those reported by other studies [100][101][102], which also recorded a greater number of immature individuals.…”

“…The size range of this work (49-123 cm TL) was very similar to that documented in the Colombian Pacific in 2001 (50-125 cm TL) [100], but in the Ecuadorian Pacific the size range was wider in 2013 (41.4-135 cm TL) [101]. Females were significantly more abundant than males, disagreeing with what was documented in the Colombian [100] and Ecuadorian [101], where the sexual proportion was no different from parity. The length at maturity for males of this work (95.93 cm TL) was similar to that reported in the Gulf of California (91.5 cm TL) [102] and in the Ecuadorian Pacific (97.2 cm TL) [101].…”

Evaluación biológica, fisicoquímica y de potencial tecnológico del tiburón azul (Prionace glauca) procedente del pacifico sur peruano

“…En este caso, el valor de b dependería del hábitat y del número de muestras utilizadas en este tipo de análisis, resultando en estimaciones que definen tipos de crecimientos, como el Figura 4. Relación entre el peso total (PT) y longitud total (LT) de machos y hembras de tiburón azul (Prionace glauca) en el mar peruano Los coeficientes de determinación muestran la alta correlación positiva que existe entre la LT y el PT de los tiburones de estudio (R 2 Hembras = 0.9089 y R 2 Machos = 0.9564), una relación morfométrica de utilidad en la detección de sesgos en la recopilación de la información, cuando estos organismos son desembarcados sin cabeza o sin cola (Briones et al, 2018). Es importante mencionar que los estudios del uso de los rendimientos corporales y las relaciones morfométricas en peces cobran relevancia desde un punto de vista económico, ya que, a través de ellos, pueden hacerse una estimación de la productividad en la industria procesadora pesquera, así como evaluar la biomasa de los recursos si sólo se dispone de datos de talla (Chodrijah y Faizah, 2021).…”