Cormorants and other wildlife populations have come in real or perceived conflicts with humans over exploited fish stocks. From gut contents of cormorants, and using an extension of the Catch equation, we estimated the degree of short term competition between great cormorants and coastal fisheries in two areas along the Swedish Baltic Sea. Cormorants consumed 10 and 44%, in respective area, of ...

Behavioral assays constitute important research tools when assessing how fish respond to environmental change. However, it is unclear how behavioral modifications recorded in laboratory assays are expressed in natural ecosystems, a limitation that makes it difficult to evaluate the predictive power of laboratory-based measurements. In this study, we hypothesized that exposure to a benzodiazepin...

—The roles of temperature and ultraviolet radiation (UVR) in determining the spawning success of yellow perch Perca flavescens were investigated in two Pennsylvania lakes with different dissolved organic carbon (DOC) concentrations. In situ incubation experiments were used to manipulate temperature and UVR and to examine hatching time and hatching success. Extensive scuba surveys were used to d...

As in various freshwater and coastal marine ecosystems worldwide, seasonal bottom water hypoxia is a recurring phenomenon in Lake Erie’s central basin. While bottom hypoxia can strongly affect sessile benthic animals, its effects on mobile organisms such as fish are less understood. We evaluated the potential for bottom hypoxia to affect the growth rates of yellow perch Perca flavescens, a spec...

some parasites can be transferred from fish to human via eating of contaminated meat and make serious problems in consumers. in the present study zoonotic parasites of abdominal cavity in pike-perch, sander lucioperca, in south eastern part of the caspian sea have been surveyed. in this regard, 30 fish were caught by purse seine net and abdominal cavity, digestive tract and other organs (kidney...

BACKGROUND: Eurasian watermilfoil (Myriophyllum spicatum L.) is a widespread submersed aquatic plant that causes nuisance problems across the continental United States. Eurasian watermilfoil is an herbaceous perennial submersed aquatic plant that typically grows in water depths of 1 to 3 m (Aiken et al. 1979). Vegetative propagation is either by direct stem fragments or by autofragmentation thr...

This study investigated the effects of different protein sources and butyric acid contents in aquafeed on growth, survival rate, lipid peroxidation enzymes, intestinal villi 7.3 g jade perch, Scortum barcoo. The experimental treatment groups were whole fish meal (FM) group, FM + (FMB) 50% black soldier fly (FBM) FBM (FBMB) (BM) BM (BMB) group. results showed that perch fed with FMB feed had a s...

Some parasites can be transferred from fish to human via eating of contaminated meat and make serious problems in consumers. In the present study zoonotic parasites of abdominal cavity in pike-perch, Sander lucioperca, in south eastern part of the Caspian Sea have been surveyed. In this regard, 30 fish were caught by purse seine net and abdominal cavity, digestive tract and other organs (kidney...

 A 6-week feeding experiments were carried out to determine the effects of different levels of dietary betaine on growth performance, food efficiency and survival rate of pike perch which has a critical period during transition feeding. Fingerlings of pike perch were fed with live food (treatment A), without betaine added to biomar (treatment B), 1% betaine added to biomar (treatment C) and 2% ...