Some biological aspect of the smallest goby fish (Knipowitschia caucasica Berg , 1916) in Gorgan Bay, Caspian Sea

This research was conducted in Gorgan Bay in 1994. The results showed that spawning of Goby fish, in southern part of Caspian Sea in the area of Gorgan Bay, from early winter to early spring had been gradually. The biggest nun fish in length which caught was 46 mm. There was positive correlation between length and body weight in males and females and this ratio was higher in females than males. Fishes had positive algometric growth over all male to female ratio was 1-1.1. The range of relative fecundity was 290 to 550 eggs and in average 395.5 which was depended on the length of fish

An investigation on Vibrionaceae family of bacteria as probiotic factors in shrimp culture

We investigated the effects of Vibrionaceae family of bacteria as probiotics in the process of growth and survival rate of shrimp during propagation stages. Bacterial flora were extracted from seawater, culture farms, shrimp culture farms and sludge of private propagation farms. Different bacteria such as Vibrio alginolyticus (serotype 1-4), Vibrio splendidus I, Vibrio fluvialis II, Vibrio anguillarum I, Vibrio costicul, Vibrio vulnificaus, Vibrio nereis, Vibrio camplbelli, Vibrio natriegens, Vibrio proteolyticus, Vibrio plegius II ,Vibrio fischeri, Aeromonas hydrophila, Aeromonas schuberti, Aeromonas salmonisida, Aeromonas veronii were isolated, identified and lyophilized. These bacteria were used in different experiments on shrimp life cycle stages while the shrimps were being fed on live food such as Chaetoceros, Skeletonema and Tetraselmis algae. Vibrio alginolyticus (serotype 1) with 107 cells/ml increased proliferation of Tetraselmis sp to 71 % in 6 days compared to the control experiment. Also Vibrio alginolyticus (serotype 4) with 105 cells/in' increased Tetraselmis sp. production to 389% in 6 days compared to control. Vibrio splendidus I was also found to be able to increase shrimp fork length in postlarvae stage 3 up to 23% as compared to control. Vibrio alginolyticus and Vibrio fischeri increased survival, fork lenght and body weight of green tiger shrimp in postlarvae stage significantly (P<0.05)

An introduction of photobioreactor technology in mass culture of algea in order to improve the shrimp culture in Iran

Algae production in controlled condition is one one the most important subject that ought to studying . This kind of algae production can use for biosynthesis great syuffs like as vtamines and unsaturated fatty acids. For achieving this goal < this project was designed and done. At this project some procedures like steril cultivation < light controlling, remove and dissolving gases as oxygen and carbon dioxide, mixturing tank, intelligent sensor, biofilter purifying, dechloration vessel and dosing pumps are new phenomenas are used. Finally, chlorella sp from Gilan institute were culativated more than 16000000 cells per one millimeter

Optimum management of warmwater fish farms stocking, capacity determination, growth rate and brood stock managements and harvesting

This study was conducted to codify the guideline and indexes of optimal management in warm-water fish farms to attain sustainable aquaculture which they are population density, species diversity, brood stock'smanagements, capacity determination, growth and harvesting managements in cultural ponds. As results, these guideline and indexes were codifies for these fish farms and propagation centers. It's obviously that these sustainable patterns can be used for improving of permanent development for this aquacultural industry

Cage culture of tilapia in some water resources (farm and agriculture ponds) of Bafq, Iran

Tilapia is the second cultured fish in the world. Up to 135 countries produces tilapia. Intensive culture systems of tilapia such as cage culture are recently developed because of limitations of water resources. In Iran, studies about tilapia were started in National Research Center of Saline Water Aquatics from November 2008 and some aspects of tilapia aquaculture and culture systems are surveyed. Investigation about cage culture of Nile tilapia, Oreochromis niloticus was performed in two culture periods of 2012 and 2014 in fresh and brackish water conditions of Iran for the first time. Stocking densities of fish in the cages were 25, 50, 75, 100, 125 and 150 fish/m^3. 100g fish stocked reached 272-331 g during 80 days in the first study. However, 50g fish stocked reached 329-450 g during 145 days in the second study. Results of cage culture of tilapia in fresh and brackish water conditions showed ranges of FCR: 1.56-3.72 and 1.08-1.87, DGR: 1.63-2.91 and 2.14-2.92 g/day, SGR: 0.63-1.12 and 1.29-1.54, production: 5.98-38 and 7.17-41.6 kg/m^3, respectively. Stocking densities 75-125 fish/ m^3 were appropriate especially in fish reared in brackish water cages

Aquaculture code of conduct and mechanization management

In this report rules and focal points about code of conduct for cold water farm, warm water establishment, mechanization management and oxygen generators are collected and discussed. One of the most important point difference between aquaculture engineering with mechanization. Mechanization is improvement of management level from ancient to better by some special tools but aquaculture engineering can do by any vessel in every management