Spawning Of Carp Research Articles

IDE IT IS THE PROSPECTIVE OBJECT FOR AGRICULTURAL FISH FARMING

The Ide (Leuciscus idus) it is the cold-water fish, which allows for carp spawning usage for natural and artificial reproduction. The article presents materials about the Ide cultivation in the pond polyculture as potential object for agricultural reservoirs. The Ides are characterized by high immunological and physiological status; its blood cell morphology differentials contain up to 30% of the small lymphocytes (5 mkm). High activity of the humoral factor (congenital immunity) was indicated (complement - 0.24, properdin - 2.28 U / ml). Fish-biological estimation was carried out in fish farms in 1-2 fishing zones. Spawnings received from group were taken to grow two-year-olds yearlings. The weight of the yearlings varied within 5-7 g. Carps and Ides were realized in to the fishing pond with total area of 57 hectare with the density of 1000 unit/ ha and 20 unit/ha (2% in relation to carp) respectively. The biological features of these fish are briefly described and the questions of growing various age groups are considered, up to the formation of brood stocks. It is established that the Ides spawning is active in the conditions of carp spawning ponds, and the Ide’s intensity of growth in the first and second years of life in ponds is higher than in natural conditions. In the fishery "Shostka" the two-year-olds Ide reached 180... 200 g. A comprehensive assessment of the Ide producers in the "Shostka" and "Kirya" farms showed that Ide can be included in the Carp producing technology with the allocation of the wintering pond which will be harvested at an earlier time. In our opinion, it is most expedient to use the natural reproduction way – to spawn in early spring in spawning carp ponds, while the weight gain of the eggs can reach 300 ... 600 g.

Experimental Control of Carp Reproduction through Water Drawdowns in Fort Randall Reservoir, South Dakota

Water drawdowns of 1 1/2 to 2 feet were effected at Fort Randall Reservoir immediately following periods of major carp spawning in 1955, 1956, and 1957. Eggs thus exposed were killed. Predictions of the time of spawning were based on gonadal conditions of mature fish, water temperature and weather forecasts. Major spawning occurred in shallow (less than 1 foot deep) flats during periods of warm, calm weather when open-water temperature first reached 62–68° F. Effectiveness of the drawdowns in limiting carp reproduction was judged by the size of the age class produced each year in comparison to a previous year and to other species sampled by the same methods of spot-poisoning, shoreline seining, gill netting and frame netting. Size of the age class of carp established each year was relatively small. It is concluded that the planned drawdowns were primarily responsible for poor reproduction.