An experiment was undertaken to develop a suitable seed production technique for Sperata aor in captivity. Naturally produced fry of aor was reared at different densities in nine nursery ponds 0.012 ha in size with an average depth of 0.8 m each. Three stocking densities tested, each of which was triplicated. Fry of aor stocked at 100,000/ha was designated as treatment-1 (T1), 150,000/ha as tre...

in this study, length-weight relationship of three populations of fingerling roach (rutilus rutilus caspicus), wild, farmed and mix were investigated with the fish reproduce in the center of the proliferation of bony fish syjeval harber. in order to check the length-weight, 587 sample fish by hand sachook during the release into the sea. minimum and maximum total length of respectively 17.14 (f...

The Tongariro River supports a world renowned trout fishery and a nationally important hydroelectric power scheme which has caused profound changes to the river's flow regime and some minor changes to its fishery. Specifications for the regulated compensation flow in the lower river, whilst originally intended to protect the fishery, constrain electricity generation and fail to address all requ...

The Amazonian cichlid peacock bass (Cichla sp.) is a highly marketable food and sport fish, therefore a suitable species for aquaculture. However, because of its piscivorous feeding preferences, the species does not accept dry feeds voluntarily, turning its intensive culture difficult and costly. This study aimed to wean fingerling peacock bass from inert moist food to dry diets. In a first exp...

The effect of penicillin-G on Flavobacterium psychrophilum, the cause of bacterial coldwater disease, was evaluated in 15 min and overnight exposures. Separate tests evaluated the effect of increasing doses of penicillin-G to rainbow trout Oncorhynchus mykiss eggs, fingerlings, and adults. Rainbow trout eggs were exposed for 1 h to penicillin doses of 0, 250, 500, 1000, 10,000, 50,000, or 100,0...

Naturally occurring chlorophylls (Chl) have shown anti-mutagenic activity but little is known about their chemoprotective properties in vivo. This study examined the effect of Chl on formation in vivo of DNA adducts by the potent environmental carcinogen dibenzo[a,l]pyrene (DBP), using rainbow trout as the animal model. Fingerling trout were fed diets containing 200 p.p.m. DBP alone or with one...

in this study, the morphology and organization of pituitary was investigated prior to hatching and at larval, juvenile and adult stages of the rutilus frisii  kutum. the eggs were kept in aquaria to study the stages before hatching. fingerling reaching 1 gr of weight were maintained in laboratory condition for 5 month. specimens larger than 1 gr up to adult stage were obtain either from fish cu...

abstract environmental factors including salinity and temperature can affect the physiology and performance of the growth of fish, so many of internal organs such as gill may be showed wide range of morphological and functional changes. fingerling common carp were exposed for 21 days in groups at 20, 25 and 30°c and three salinity levels 0, 5 and 10ppt. histological changes of gills tissue of c...

Invasive crayfish (family Cambaridae) displace native species and alter aquatic habitat, community structure, ecosystem function. We evaluated whether chemical control can be a reliable agent for to ensure that shipments from fish hatcheries did not result in new infestations of invasive crayfish. A series acute (≤1 h) toxicity tests were conducted evaluate the cypermethrin pyrethrin crayfish, ...

The influence of six semi-purified diets having different nutrient composition on the tissue free Ž . amino acid FAA levels of fingerling rainbow trout was examined. Four balanced amino acid Ž . Ž Ž . Ž .. diets casein:gelatins6:1 with combinations of two protein levels 35% LP and 50% HP and Ž Ž . Ž .. Ž . Ž two fat levels 10% LF and 20% HF , and two imbalanced high-protein 50% diets IMB-HP, . ...