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Evaluation of an Experiment in Lacustrine Rearing of Juvenile Anadromous Atlantic Salmon
Author(s) -
Pepper V. A.,
Oliver N. P.,
Blundon R.
Publication year - 1985
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 - 10.1577/1548-8659(1985)5<507:eoaeil>2.0.co;2
Subject(s) - fish migration , juvenile , fishery , biology , ecology , fish <actinopterygii>
A 3‐year anadromous Atlantic salmon (Salmo salar) stocking experiment is described in which swim‐up fry were planted into inlet streams immediately above natural ponds and also directly into lacustrine habitats. Fry‐to‐smolt survival ranged from a high of 20% to a low of 0.9% and was influenced possibly by water nutrient levels and associated secondary productivity. Minimum survival from smolt to adult stages was estimated to be 4‐15%. Most of the lacustrine parr smoltified at Age 3. Early maturation was recorded for parr from one of the stocking locations. Residual parr (post smolt) were produced from the last year class stocked. All of these parr were males. This early maturation and residualism is discussed relative to the phenomenon of delayed smoltification. Means of remedying the delayed smoltification problem are proposed. Swim‐up fry may be stocked directly into shallow lacustrine habitat without immediate mortality due to this type of stocking per se. Optimal stocking densities and strategies for this type of habitat have yet to be defined.