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Full-Text Articles in Aquaculture and Fisheries

Limulus In The Limelight: Exploring An Ancient Species, John Tanacredi Ph.D. Jan 2004

Limulus In The Limelight: Exploring An Ancient Species, John Tanacredi Ph.D.

Faculty Works: CERCOM

In an era when sports numbers shatter historical ceilings (especially in baseball) and fall by the wayside like fall leaves, a most enduring record of life continues to crawl along emerging from the sea early each spring pronouncing their incredible "record" of existences... over 350 million years. Now there is a number that even the rarified air of baseball salaries can admire. Yet, today the remarkable sea creature which endured over 100 million years of dramatically changing earth history prior to the existence of the dinosaurs, and which is comprised of only four species globally, is being tested for its ...


Species Composition And Geographic Distribution Of Virginia's Freshwater Gastropod Fauna: A Review Using Historical Records, Timothy W. Stewart, Robert T. Dillon Jr. Jan 2004

Species Composition And Geographic Distribution Of Virginia's Freshwater Gastropod Fauna: A Review Using Historical Records, Timothy W. Stewart, Robert T. Dillon Jr.

Natural Resource Ecology and Management Publications

Survey data from electronic databases and the literature were used to summarize knowledge of the composition and geographic distribution of Virginia's freshwater gastropod fauna. After excluding records likely based on misidentifications, we concluded that 53 species of freshwater gastropods occur in Virginia now or historically. A map and/or narrative description of statewide distribution was produced for each species. Several species appeared to be restricted to a few sites and highly endangered, including the hydrobiids Fontigens bottimeri, Fontigens morrisoni, Holsingeria unthankensis, and Holsingeria sp. 1. Absence of recent records for the hydrobiid Sompatogyrus virginicus, the pomatiopsid Pomatiopsis cincinnatiensis, the ...


Can We Predict Joint Effects Of Hypoxia And Metals On Fish Survival?, Michael C. Newman Jan 2004

Can We Predict Joint Effects Of Hypoxia And Metals On Fish Survival?, Michael C. Newman

VIMS Books and Book Chapters

Fish are suddenly exposed to hypoxic conditions during diverse events such as seiche- or turnover-related water movements, bottom water release from reservoirs, ice-over of eutrophic arctic lakes, and rapid shifts in respiration: photosynthesis associated with cultural eutrophication. In each case, chemical equilibria established under hypoxic conditions that result in metal dissolution and accumulation suddenly shift toward chemical equilibria of oxic conditions. Critical changes in speciation include those determining the free ion activity that, as expressed by the Free Ion Activity Model (FIAM), is often the most bioactive form of a dissolved metal. Metal phase can also change rapidly and, in ...


Consumption Dynamics Of The Adult Piscivorous Fish Community In Spirit Lake, Iowa, Hongsheng Liao, Clay L. Pierce, Joe G. Larscheid Jan 2004

Consumption Dynamics Of The Adult Piscivorous Fish Community In Spirit Lake, Iowa, Hongsheng Liao, Clay L. Pierce, Joe G. Larscheid

Natural Resource Ecology and Management Publications

At Spirit Lake, one of Iowa’s most important fisheries, walleye Sander vitreus (formerly Stizostedion vitreum) is one of the most popular species with anglers. Despite a century of walleye stocking and management in Spirit Lake, walleye growth rate, size structure, and angler harvest continue to decline. Our purpose was to determine the magnitude and dynamics of walleye population consumption relative to those of other piscivorous species in Spirit Lake, which would allow managers to judge the feasibility of increasing the abundance, growth rate, and size structure of the walleye population.We quantified food consumption by the adult piscivorous fish ...