in this investigation, the mercury content of different samples of persian gulf shrimp and fish, caspian sea fish and the samples of fish from bandar pahlavi lagoon, zarjoub river near rasht, zayandehroud river near esfahan, and karadj river near tehran were measured by flameless atomic absorption, cold vapor-technique, using standard addition method. the main purpose of this study was to inves...

ABSTRACT One of the constraints in pirarucu, Arapaima gigas farming is reproduction captivity, due to inconsistent number spawning events per reproductive cycle, thus, unreliable availability juvenile fish. This a first-hand report on predation pirarucu larvae by opportunistic fish species breeding pond. Fish samples were collected for stomach content analysis from pirarucu-breeding pond with r...

We employed ultrasonic trans­ mitters to follow (for up to 48 h) the hor­ izontal and vertical movements of five juvenile (6.8–18.7 kg estimated body mass) bluefin tuna (Thunnus thynnus) in the western North Atlantic (off the eastern shore of Virginia). Our objective was to document the fishes’ behavior and distribution in relation to ocean­ ographic conditions and thus begin to address issues ...

The Cueva del Azufre in Tabasco, Mexico, is a nutrient-rich cave and its inhabitants need to cope with high levels of dissolved hydrogen sulfide and extreme hypoxia. One of the successful colonizers of this cave is the poeciliid fish Poecilia mexicana, which has received considerable attention as a model organism to examine evolutionary adaptations to extreme environmental conditions. Nonethele...

this trial was conducted to investigate the effect of phospholipid on blood and serum factors in rainbow trout (oncorhynchus mykiss) fed fat powder. phospholipid in two levels was added to 20 percent fat based on diet including 50% fat powder. control diet contained fish oil instead of fat powder and was lack of phospholipid. 150 juvenile rainbow trout with initial mean weight of 27.45±1.88g st...

The present study was carried out to determine the ability of Acipenser baerii in utilizing carbohydrate (dextrin) as a non protein energy source substituted with animal oil. A total of 65 juveniles A. baerii with an initial mean weight of 689 ± 62 g were distributed in 15 fiber glass tanks. Five diets were formulated including 0, 5, 10, 15 and 20% of dextrin and fed  for 8 weeks. Fish were wei...

to investigate the effect of dietary supplementation of l-carnitine on resistance to temperature and salinity stresses in sobaity fry, an experiment was carried out with 240 pieces of fish with average initial weight of 3.01±0.03 g for 10 weeks. experimental treatments were consisted of four levels of 0, 500, 1000 and 1800 (respectively control, lc500, lc1000 and lc1800) mg l-carnitine per kg o...