Postrelease growth and maturity of hatchery-reared Rio Grande Silvery Minnow DOI

Paige M. Dunnum,

Thomas P. Archdeacon, Robert Dudley

et al.

North American Journal of Fisheries Management, Journal Year: 2025, Volume and Issue: unknown

Published: April 19, 2025

Abstract Objective Captive propagation and supplementation are used for conservation of endangered fishes. Breeding programs have been to prevent extinction the Rio Grande Silvery Minnow Hybognathus amarus. However, postrelease effectiveness is not often evaluated. Our objective was compare growth rate size at maturity between wild hatchery-reared individuals this short-lived species. Comparing patterns hatchery those will provide insight into optimization improve strategies. Methods We multiple long-term data sets length measurements estimate rates maturity. age obtained from otoliths compared them known-age released in middle Grande, New Mexico. First, we estimated von Bertalanffy parameters based on monthly intervals. Next, logistic regression collected 2018–2019 individuals. Results Hatchery-reared were smaller than their counterparts release remained so until an about 1.5 years. Hatchery fish grew slower (growth coefficient k = 0.08) (k 0.10) but had a larger average maximum (86.6 mm versus 78.6 standard length). that over 50% females sexually mature by April 14 during our study, 19 females. Conclusions Since upon length, they lower fecundity Fish culture methods raise may be more effective improving survival spawning increasing relative results guide design other small-bodied,

Language: Английский

Postrelease growth and maturity of hatchery-reared Rio Grande Silvery Minnow DOI

Paige M. Dunnum,

Thomas P. Archdeacon, Robert Dudley

et al.

North American Journal of Fisheries Management, Journal Year: 2025, Volume and Issue: unknown

Published: April 19, 2025

Abstract Objective Captive propagation and supplementation are used for conservation of endangered fishes. Breeding programs have been to prevent extinction the Rio Grande Silvery Minnow Hybognathus amarus. However, postrelease effectiveness is not often evaluated. Our objective was compare growth rate size at maturity between wild hatchery-reared individuals this short-lived species. Comparing patterns hatchery those will provide insight into optimization improve strategies. Methods We multiple long-term data sets length measurements estimate rates maturity. age obtained from otoliths compared them known-age released in middle Grande, New Mexico. First, we estimated von Bertalanffy parameters based on monthly intervals. Next, logistic regression collected 2018–2019 individuals. Results Hatchery-reared were smaller than their counterparts release remained so until an about 1.5 years. Hatchery fish grew slower (growth coefficient k = 0.08) (k 0.10) but had a larger average maximum (86.6 mm versus 78.6 standard length). that over 50% females sexually mature by April 14 during our study, 19 females. Conclusions Since upon length, they lower fecundity Fish culture methods raise may be more effective improving survival spawning increasing relative results guide design other small-bodied,

Language: Английский

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