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Impacts of Water Quality and Hand‐Picking of Dead Eggs on the Survival of Brown Trout and Atlantic Salmon Eggs
Author(s) -
Sutela Tapio,
Pasanen Pentti,
Louhi Pauliina,
MäkiPetäys Aki
Publication year - 2007
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/a06-028.1
Subject(s) - salmo , biology , brown trout , hatchery , incubation , fishery , egg incubation , human fertilization , trout , water quality , ecology , zoology , fish <actinopterygii> , agronomy , biochemistry
The effect of water source and removal of dead eggs by hand on egg survival of brown trout Salmo trutta and Atlantic salmon S. salar was studied experimentally in a hatchery trial, which started from fertilization in October and lasted until egg eye‐up in early March; no antifungal chemical treatments were used. The experimental treatments were water source (surface water, filtered surface water, or groundwater), species, and hand‐picking of dead eggs (used, not used); we used four replicates per treatment, resulting in 48 batches. Incubation of eggs in groundwater yielded higher egg survival to eye‐up than incubation in surface water or filtered surface water. Hand‐picking of dead eggs enhanced survival of eggs incubated in surface water but not those incubated in groundwater. The best combination for egg survival in both species was the use of groundwater incubation without hand‐picking of dead eggs.