RESPONSE OF CUTTHROAT TROUT EMBRYOS TO REDUCED INCUBATION TEMPERATURES AT DIFFERENT DEVELOPMENTAL STAGES

Authors
HUBERT WA STONECYPHER RW GERN WA BOBBIT J
Citation
Wa. Hubert et al., RESPONSE OF CUTTHROAT TROUT EMBRYOS TO REDUCED INCUBATION TEMPERATURES AT DIFFERENT DEVELOPMENTAL STAGES, The Progressive fish-culturist, 56(3), 1994, pp. 185-187
Citations number
7
Categorie Soggetti
Fisheries
Journal title
The Progressive fish-culturist → ACNP
ISSN journal
00330779
Volume
56
Issue
3
Year of publication
1994
Pages
185 - 187
Database
ISI
SICI code
0033-0779(1994)56:3<185:ROCTET>2.0.ZU;2-L
Abstract
We assessed the influence of developmental stage on the survival and g rowth of embryos of cut-throat trout (Oncorhynchus clarki) fertilized at 7-degrees-C and subsequently cooled to 5 or 3-degrees-C. Cooling fr om 7-degrees-C took place after 2 h of water hardening, as well as 15, 25, and 35 d after fertilization. Mean survival to hatching was lowes t (35%) among embryos cooled to 3-degrees-C immediately following wate r hardening, but it was highest (94%) among embryos cooled to 3-degree s-C following incubation at 7-degrees-C for 15 d. Mean survival among embryos maintained at 7-degrees-C throughout incubation was 79%. Cooli ng the embryos to 3-degrees-C after 15 d at 7-degrees-C prolonged the time to hatching by 1 month and enhanced survival to hatching by 15% o ver embryos maintained at 7-degrees-C.