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Spawning and hatching of endangered Gila Chub in captivity

North American Journal of Aquaculture

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and ORCID iD
https://doi.org/10.1080/15222055.2016.1167798

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Abstract

Information on reproductive characteristics of the endangered Gila Chub Gila intermedia is largely limited and qualitative, and culture techniques and requirements are virtually unknown. Here we provide the first published data on spawning and selected reproductive and developmental characteristics of Gila Chub. Fish were brought to the laboratory in March 2003 from Sabino Creek, Arizona (12.3°C). Fish were then warmed slowly and spawned at 14.9°C, 10 d after collection. Following this initial spawning, Gila Chub spawned consistently in the laboratory without hormonal, chemical, photoperiod, temperature, or substrate manipulation during all times of the year. Spawns were noted at temperatures ranging from about 15°C to 26°C; however, we noted that Gila Chub spawned less frequently at temperatures above 24°C. Multiple spawning attempts per year per individual are probable. There was a strong, inverse relationship between time to hatch and incubation temperature. The hatch rate of eggs was high (mean = 99.43%), and larval Gila Chub accepted a variety of natural and formulated diets at first feeding. The future of Gila Chub may someday depend in part on hatchery propagation to provide specimens for restocking formerly occupied habitats and establishing refuge populations. Information from our study can aid future efforts to successfully spawn and rear Gila Chub and related species.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Spawning and hatching of endangered Gila Chub in captivity
Series title:
North American Journal of Aquaculture
DOI:
10.1080/15222055.2016.1167798
Volume:
78
Issue:
4
Year Published:
2016
Language:
English
Publisher:
Taylor & Francis
Contributing office(s):
Coop Res Unit Seattle
Description:
5 p.
First page:
279
Last page:
283