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Observations Concerning Reproductive Temperature Requirements of Captive Lahontan Cutthroat Trout
Author(s) -
Bigelow John P.,
Rauw Wendy M.,
GomezRaya Luis
Publication year - 2009
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/a08-064.1
Subject(s) - biology , fecundity , ovulation , oncorhynchus , trout , reproduction , fishery , zoology , oocyte , fish <actinopterygii> , ecology , embryo , endocrinology , demography , population , sociology , hormone
Abstract The effects of holding temperature during late oocyte development and spawning on the timing of ovulation, fecundity, and egg survival in female Lahontan cutthroat trout Oncorhynchus clarkii henshawi in three postovulatory regimes were investigated. The timing of ovulation was similar for females held at 7.2°C and 12.4°C from 2.5 to 6.0 months before the time of ovulation until spawning. Mean fecundity was higher for females held at 7.2°C. Mean egg eye‐up, hatch, and swim‐up rates were also higher for females held at 7.2°C. Eggs collected 1, 4, and 7 d postovulation exhibited similar survival rates within females regardless of holding temperature.