Louis A. Helfrich

TL;DR: On-site interviews and a mail questionnaire survey of 377 anglers on two Virginia rivers were used to evaluate the concept of recreational specialization for differentiating angler subgroups, and highly specialized anglers were likely to cite resource-related motives.

TL;DR: Maximum gonad size, determined from scans of the entire gonad, proved to be a more consistent index of maturity than average gonad sizes, and is a simple, effective, and non-invasive method to sex and assess maturational status of adult striped bass and perhaps other commercially and ecologically valuable (endangered) species.

TL;DR: In this paper, five Virginia trout farms were selected for examination of effluent impacts on downstream water quality, periphyton production, and composition of macroinvertebrate and fish communities during fall 1994 and summer 1995.

TL;DR: The main endocrine effect of compressing the photothermal and gametogenic cycles was to shorten the early period of sustained low hormone levels, during which most oocyte growth and the early stages of spermatogenesis occur, Consequently, final oocyte size and ovary or testes diameter were diminished in fish matured on short cycles.

TL;DR: Survival of larvae was directly correlated with the proportion of coarse substrate in the nest, and mortality of larval bluegills was significantly greater in unguarded nests than in guarded nests.