We describe 15 new variable microsatellites in the freshwater snail Aplexa (Physa) marmorata, as well as conditions for multiplexing and simultaneous genotyping sets of loci. Two to 11 alleles were detected per locus over the five populations studied, and up to eight alleles per locus and population. The observed heterozygosity was extremely low, most probably as the consequence of high selfing...

In 1976 the Wisconsin Department of Natural Resources established a refuge for a nearly depleted population of lake trout (Salvelinus namaycush) at Gull Island Shoal, Lake Superior. The refuge was intended to reduce fishing mortality by protecting adult lake trout. We examined the growth dynamics of these lake trout during the period of recovery by comparing estimates of individual growth befor...

We develop the theory of biphasic somatic growth in fish using models based on the distinction between pre- and post-maturation growth and an explicit description of energy allocation within a growing season. We define a 'generic biphasic' (GB) model that assumes post-maturation growth has a von Bertalanffy (vB) form. For this model we derive an explicit expression for the gonad weight/somatic ...

We compared the congruence in genetic variation and phylogenetic relationships among mitochondrial DNA (mtDNA) haplotypes detected with restriction-fragment-length polymorphisms (RFLPs) and sequence analysis in the brook charr, Sulvelinus fontinalis Mitchill. This was accomplished by analyzing variation both at 172 restriction sites subsampling 903 bp over the entire mitochondrial genome and in...

Bluegill Lepomis macrochirus Maturation at younger age and lower condition (lakes in Minnesota: Drake et al., 1997; source: Istockphoto). Atlantic silverside Menidia menidia Reduced growth rate; decrease in fecundity, egg volume, larval size at hatching, larval growth rate, larval survival, consumption, growth efficiency, food conversion efficiency, willingness to forage under threat of predati...

1. The differentiation of myotomal muscles in the brook trout (Salvelinus fontinalis Mitchill) has been investigated using p-phenylene diamine stained semi-thin sections and cytochemical and quantitative determinations of enzyme activities. 2. Evidence is presented that the range of fibre size in white muscle represents stages in growth rather than distinct fibre types. 3. Electromyography show...