In Lake Saint-Pierre (LSP), the last great widening of the St. Lawrence River (province of Québec, Canada), the yellow perch has been experiencing a significant decline since the mid-1990s. The combined effect of several stressors (deterioration of habitats appropriate for reproduction and growth, invasive species and poor water quality) seems to exert considerable influence on the yellow perch...

Maru fish is one of the carnivorous ornamental that are high value, have two color variants, namely yellow maru and red types display various patterns at different sizes. With this consideration, purpose research part stage must be carried out if cultivation actor wants to make steps for domestication. This study states each temperature level greatly affects blood glucose levels which indicates...

We analysed the movements of the growing yellow phase using a long-term mark–recapture programme on European eels in a small catchment (the Frémur, France). The results showed that of the yellow eels (>200 mm) recaptured, more than 90% were recaptured at the original marking site over a long period before the silvering metamorphosis and downstream migration. We conclude that yellow European eel...

Zinc is an essential micronutrient for freshwater fish but can be toxic to them at elevated concentrations. Therefore, the regulation of zinc uptake is important in maintaining homeostasis when fish are chronically exposed to elevated zinc in nature. This study examined the kinetics of in vivo branchial and in vitro intestinal zinc uptake in wild yellow perch (Perca flavescens) from metal-conta...

A conspicuous yellow tumour was found for the first time in January 1989 among hooknose Agonus cataphractus collected from different parts of the German Wadden Sea. Prevalence of the tumour was 0.7 %. The tumours arose from connective tissue and were classified as fibromas or possibly fibrosarcomas Electron microscopy revealed the presence of lentiwus-like particles within cytoplasmic vacuoles ...

BACKGROUND Hikui disease is a well known disfiguring disease of koi carp (Cyprinus carpio) primarily affecting fish with red pigmentation. It causes light orange to golden yellow, multifocal to coalescing raised patches, starting from the red cutaneous areas. Some cases respond to surgery or topical treatment, but recurrence is common. OBJECTIVES To describe the clinical and pathological pres...

Wild-type germ cells of the viviparous fish, Lebistes (Poecilia) reticulatus, were irradiated in the stages of oogonia, spermatogonia or spermatozoa with 1000 R of X rays at a dose-rate of 200-220 R/min. The grown-up fish were mated after irradiation or sham treatment to unirradiated mutant fish homozygous for three recessive gene loci, causing albinism, lack of yellow and reddish pigmentation ...

Carotenoid pigments are responsible for many examples of sexually attractive red, orange, and yellow coloration in animals and play an important role in antioxidant and immune defenses. Because vertebrates cannot synthesize carotenoids, limited dietary availability may impose a trade-off between maintaining ornamental coloration and health. We used an experimental approach to test the carotenoi...

INTRODUCTION Accidents caused by fish are common in inland fishing communities in Brazil, being work-related injuries in the majority of cases. These populations have no information on the mechanisms of trauma or envenoming. METHODS Through a questionnaire administered to fishermen, we obtained clinical and epidemiological data on accidents in Rosana, Pontal do Paranapanema, State of São Paul...

Environmental contaminants have been identified as endocrine disruptors through their antiandrogenic activity. Thus, as androgen receptor antagonists, the fungicide vinclozolin and the principal DDT metabolite p,p'-DDE have been demonstrated to induce demasculinization in rats. Whether this is also the case in fish remains to be demonstrated. For a period of 30 days, groups of adult male guppie...