Studies on breeding of Common carp (Cyprinus carpio Lin.) using modified breeding technique
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Date
2010
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Publisher
CCSHAU
Abstract
Common carp (Cyprinus carpio) is one among the earliest species to be cultured. Its
maturation and breeding is affected by biotic and abiotic environmental conditions of water. Nutrition is
known to have profound effect upon gonadal growth as well as larval development. Common carp
breeding is still very traditional in India, including Haryana.Quantity of common carp seed which is
available is needed to be most economic and technique should be such that the resources are utilized
most efficiently to meet the demand of farmers and entrepreneurs.
The field experiment was designed under four sets of pond with three replicates and one
controlled experimental pond. Fish weight, length, gonad weight, Gonado somatic index and fecundity
were estimated for observing maturity of fishes. The effect of nutritious feed and environmental
conditions on fertilization, hatching and survival of larvae were also studied. In the field experiment
wide range of seasonal fluctuations were observed in the following factors. Water temperature showed a
range of 9-28.5°C throughout the experiment. There was not much fluctuation in all the experimental
pools. Conductivity values for different experimental pools were different and minimum value was
recorded during onset of winter season. The pH values were found to range between 5.2 -7.3. During
initial stages the pH value were lower and showed a gradual increase in the later stages. The variation in
DO values ranged from 4.2-7.28 mg/l in different experimental ponds. DO content increased with
higher production of photosynthetic organisms. Free CO2 varied between 0.03-6 mg/l. On cloudy day
maximum free CO2 content was found initially because of more concentration of phytoplankton.
Pattern of changes in both carbonate and bicarbonate alkalinities in different experimental sets were
more or less similar. The carbonate alkalinity was observed to show a reverse trend to that of free CO2.
It ranged between 0-5.6 mg/l. Bicarbonate alkalinity ranged from 86 to 124 mg/l in all experimental
pools during the experiment. The BOD was higher initially. The value ranged between 0.48-8.96 mg/l.
Some fluctuation is found in Hardness ranged between 156-189.7 ppm. Plankton volume ranged
between 0.015- 0.018 cc/l in different experimental sets. Highest plankton volume was recorded in 1st
week of February. The Gross primary productivity value was found to be low during clouds and rain.
Fertilization, hatching and fry produced were also observed and found to be highest in the hatchlings
produced from 6:1 male to female ratio. The highest growth was observed in hatchlings that were fed
on rice bran & mustard oil cake in 1:1@150% of initial body weight.
Description
Keywords
Vegetative propagation, Wheats, Planting, Genotypes, Developmental stages, Drying, Grain, Yields, Acidity, Biological development