Premium
Effects of Angler Wading on Survival of Trout Eggs and Pre‐emergent Fry
Author(s) -
Roberts Bruce C.,
White Robert G.
Publication year - 1992
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/1548-8675(1992)012<0450:eoawos>2.3.co;2
Subject(s) - trout , fishery , biology , zoology , fish <actinopterygii>
–The effects of angler wading on trout eggs and pre‐emergent fry in artificial redds depended on wading frequency and stage of egg or fry development and was similar for brown trout Salmo trutta , rainbow trout Oncorhynchus mykiss , and cutthroat trout O. clarki . Twice‐daily wading throughout development killed up to 96% of eggs and pre‐emergent fry. A single wading just before hatching killed up to 43%. Wading killed fewest eggs between fertilization and the start of chorion softening (except for a short period during blastopore closure when mortality increased slightly). It killed the most eggs or fry from the time of chorion softening to the start of emergence from the gravel. Restriction of wading could be an effective management tool if trout spawning habitat is limiting and angler use is high during egg development.