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Lack of Temporal Variation in Egg Size in Landlocked Fall Chinook Salmon from Lake Oahe, South Dakota
Author(s) -
Wipf Matthew M.,
Barnes Michael E.,
Durben Dan
Publication year - 2014
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1080/00028487.2013.847864
Subject(s) - chinook wind , hatchery , oncorhynchus , fishery , biology , population , zoology , fish <actinopterygii> , demography , sociology
This study examined 23 years of egg size data from a population entirely made up of hatchery‐maintained fall Chinook Salmon Oncorhynchus tshawytscha in Lake Oahe, South Dakota. Egg size data, obtained by water‐displacement during hatchery egg inventories, ranged from 4.2 to 6.6 eggs/mL over the 23 years. However, linear regression of data from either pooled lots of eggs ( y = 0.0035 x – 1.8116; P = 0.727) or individual spawns ( y = 0.0003 x + 5.3037; P = 0.907) indicated no significant change in mean egg size over time. The lack of change in egg size of Lake Oahe fall Chinook Salmon over the 23 years of this study indicates there was no hatchery‐induced evolutionary impacts on egg size.