Survival, Distribution, and Ion Composition in Two Strains of Brook Trout (Salvelinus fontinalis) Fry after Exposure to Episodic pH Depressions in an Adirondack Lake


July 6, 2015 - <>, Henry K. Van Offelen, Carl L. Schofield, Chris Keleher

Journal or Book Title: Canadian Journal of Fisheries and Aquatic Sciences

Volume/Issue: 51

Page Number(s): 792-799

Year Published: 1994

Brook trout (Salvelinus fontinalis) fry are susceptible to high mortality in acidified waters because of their
low tolerance to acidic conditions and the potential occurrence of this life stage with episodic acidification
associated with snowmelt. Prior to snowmelt, equal numbers of Assinica and Temiscamie strain fry were placed into enclosures. Twelve days after stocking, no consistent differences between strains were observed in survival, distribution, or ion composition. No fry of either strain survived in enclosures placed in shallow water (pH 4.8; 0.7 m depth). Fifty to 100% of fry of both strains survived in enclosures placed in deep water (pH 6.3; >2.0 m depth). Fry survival in long enclosures that extended from shallow to deep water was 80-99%. Within long enclosures, both strains were recovered in higher densities from middle and deep sections of the enclosures than from shallow sections. High fry survival and nonrandom distributions in the long enclosures indicated that both strains were able to avoid lethal, nearshore waters during spring snowmelt by moving to deeper water.

DOI: 10.1139/f94-077

Type of Publication: Journal Article



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