<abstract xmlns="http://www.w3.org/1999/xhtml">

A sample was analyzed of 1,129 specimens of <italic>Chirostoma chapalae</italic> from Lake Chapala, Mexico obtained from catches of local fishers between October 2016 and September 2017. Size frequency, length-weight relationships (LWRs), growth, mortality, exploitation rate, survival rate, and relative condition index were estimated. The LWRs showed negative allometric growth in females (<italic>b</italic> = 2.735) and isometric growth in males (<italic>b</italic> = 3.000). The SL∞ was 9.20 cm in females and 8.94 cm in males, and the growth coefficient k ranged from 1.80 year−1 to 1.90 year−1, and the t0 from 0.119 to 0.113. Estimated total mortality (Z = 3.20 year−1), natural mortality (M = 1.56 year−1), and fishing mortality (F = 1.64 year−1) values were higher in females. <italic>C. chapalae</italic> is at optimum, underexploited levels according to the exploitation rate (E = 0.42 year−1). The SL at first capture (SLpc) was 65.8 mm and the SL at retention (SLpr) of the fishing gear was 62.4 mm. This indicates that more than 50% of the fish caught enter the fishery at a larger size. The condition factor (Kn) showed body robustness in fall and subsequent spawning from spring onwards. Our findings contribute to the future development of fisheries management strategies in the largest lake in Mexico.
</abstract>

A sample was analyzed of 1,129 specimens of Chirostoma chapalae from Lake Chapala, Mexico obtained from catches of local fishers between October 2016 and September 2017. Size frequency, length-weight relationships (LWRs), growth, mortality, exploitation rate, survival rate, and relative condition index were estimated. The LWRs showed negative allometric growth in females (b = 2.735) and isometric growth in males (b = 3.000). The SL∞ was 9.20 cm in females and 8.94 cm in males, and the growth coefficient k ranged from 1.80 year−1 to 1.90 year−1, and the t0 from 0.119 to 0.113. Estimated total mortality (Z = 3.20 year−1), natural mortality (M = 1.56 year−1), and fishing mortality (F = 1.64 year−1) values were higher in females. C. chapalae is at optimum, underexploited levels according to the exploitation rate (E = 0.42 year−1). The SL at first capture (SLpc) was 65.8 mm and the SL at retention (SLpr) of the fishing gear was 62.4 mm. This indicates that more than 50% of the fish caught enter the fishery at a larger size. The condition factor (Kn) showed body robustness in fall and subsequent spawning from spring onwards. Our findings contribute to the future development of fisheries management strategies in the largest lake in Mexico.

Population analysis of smallmouth silverside, <italic>Chirostoma chapalae</italic> Jordan &amp; Snyder, 1899 (Atherinopsidae), an endemic fish in Lake Chapala, Mexico

Centro Universitario de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara. Las Agujas

Fisheries & Aquatic Life

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Population analysis of smallmouth silverside,  Jordan & Snyder, 1899 (Atherinopsidae), an endemic fish in Lake Chapala, Mexico

A sample was analyzed of 1,129 specimens of Chirostoma chapalae from Lake Chapala, Mexico obtained from catches of local fishers between October 2016 and...

Population analysis of smallmouth silverside, Chirostoma chapalae Jordan & Snyder, 1899 (Atherinopsidae), an endemic fish in Lake Chapala, Mexico

Online veröffentlicht: 14. Juni 2022

Seitenbereich: 44 - 56

Eingereicht: 06. Sept. 2021

Akzeptiert: 16. Feb. 2022

DOI: https://doi.org/10.2478/aopf-2022-0004

Schlüsselwörter
exploitation, fisheries, growth, Lake Chapala, mortality, silverside

© 2022 Hosmer Duvan Gomez-Vanega et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Population analysis of smallmouth silverside, Chirostoma chapalae Jordan & Snyder, 1899 (Atherinopsidae), an endemic fish in Lake Chapala, Mexico

Online veröffentlicht: 14. Juni 2022

Seitenbereich: 44 - 56

Eingereicht: 06. Sept. 2021

Akzeptiert: 16. Feb. 2022

DOI: https://doi.org/10.2478/aopf-2022-0004

Schlüsselwörterexploitation, fisheries, growth, Lake Chapala, mortality, silverside

© 2022 Hosmer Duvan Gomez-Vanega et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Schlüsselwörter
exploitation, fisheries, growth, Lake Chapala, mortality, silverside