This present study was conducted to determine fry production in different male-female sex ratios of Oreochromis niloticusbroodstock order improve production, which handicapped the development fish farming northern Senegal. A total 180 broodfish (47 males and 133 females) were stocked at a density 2 /m2and replicated three times for each ratio 1:2, 1:3and 1:4 (male : female). Mean body weight ra...

Flavobacterium psychrophilum, a member of the family Flavobacteriaceae, has from the first descriptions in North America, been distributed to many countries worldwide causing serious losses to the aquaculture industry. The Norwegian and Chilean aquacultures are also affected by outbreaks due to F. psychrophilum. The bacterium has been one of the most common causes of mortality in fresh water aq...

The present study reports the results of virological survey in fish with an emphasis on the diseases included in the Czech National Legislation. Monitoring of fish both without symptoms and with a manifested disease was performed within this virological surveillance. Between January 1999 and December 2006, viral haemorrhagic septicaemia virus (VHSV), infectious haematopoetic necrosis virus (IHN...

To assess changes of gonad development and sex steroids hormones of R. frisii kutum, broodfish were captured during spawning season 2010 (March-April) and induced intramuscularly with following hormone treatments: single injections of 1 μg kg b.w. LHRH-A2, combination of LHRH-A2 with two dopamine antagonists as follows: 1 μg kg b.w. LHRH-A2 + 5 mg kg-1 b.w. PIM, 1 μg kg b.w. LHRH-A2 + 2.5 mg kg...

A study was conducted to investigate the effects of dietary essential amino acid (EAA) concentrations on the spawning performance of Acanthopagrus latus. Broodstocks were fed with three replicates of isonitrogenous and isolipid formulated diets (diet 1, diet 2 and diet 3) with different concentrations of EAA (15.40, 16.88 and 18.14%, respectively) for 138 days. Results showed relative fecundity...

Research And Development Expansion of tilapia farming on a commercial scale was hindered by the limited availability of quality fry realized by researchers. Attempts were made to develop a practical technique of massscale fry production at the Asian Institute of Technology (AIT) in Klong Luang, Pathumthani, Thailand. A series of onstation trials were conducted over a decade, maintaining the Chi...

In fall 2013, anorexia, lethargy and mortalities up to 10-12,000 dead fish per week were observed in rainbow trout Oncorhynchus mykiss in three fresh water hatcheries (salinity 0-1 ‰) on the west coast of Norway. The fish (25-100 g) showed signs of circulatory failure with haemorrhages, ascites and anaemia. The histopathological findings comprised inflammation of the heart and red muscle and li...

—Mature channel catfish Ictalurus punctatus were exposed to water containing three different concentrations (20, 40, and 60 mg/L) of AQUI-S (50% isoeugenol) during routine handling procedures at a commercial catfish facility. Anesthetic efficacy, recovery time, and the effects of AQUI-S on routine measures of stress were compared with similar measures in a group of fish sampled prior to anesthe...

All-male tilapia stocks are widely used by farmers to supply both domestic and international markets with homogenous, large sized fish (500 g+). While a number of strategies possible, hormonal treatment fry 17α-methyltestosterone (MT) is the most common method commercial due its low cost ease application. However, contrasting current widespread use, implications MT in farming have raised concer...