Abstract
The research work was conducted to evaluate the effects of stocking density on growth, survival and production of mirror carp (Cyprinus carpio var. specularis) spawn in nursery pond for a period of 35 days. Three treatments differing in stocking density of hatchling viz., T1:172900 individuals/ha, T2:148200 individuals/ha and T3:123500 individuals/ha were employed each having three replicates. Fries were fed same diet in three different treatments consisting of (28.5%) at the rate of 6-10% of body weight. The Physico-chemical characteristics of pond water were measured weekly. The mean values of some water quality parameters such as temperature (°C) were 30.41 ±1.15 (T1), 30.38±1.08 (T2), 30.45±1.10 (T3); transparency (cm) 40.00±0.90 (T1), 39.74±0.51 (T2), 39.93±0.70 (T3); dissolved oxygen (mg/l) 6.79±0.45 (T1), 6.71±0.38 (T2), 7.02±0.29 (T3); pH 7.55±0.18 (T1), 7.67±0.16 (T2), 7.62±0.20 (T3) and alkalinity (mg/l) 116.20±0.64 (T1), 99.36±0.45 (T2), 96.47±0.93 (T3) from 35 days respectively. Except alkalinity no significant value were found for parameters. Sampling was also done weekly. The mean value of final weight (g) was 0.35±0.004 (T1), 0.42±0.008 (T2), 0.59±0.006 (T3). The survival rate of Cyprinus carpio var. specularis was 54.20% (T1), 62.90% (T2) and 74.56% (T3) respectively. The highest survivability was found in T3. The production (kg/ha) of Cyprinus carpio var. specularis was 76.32±4.96 (T1), 77.60±5.19 (T2), 91.04±6.02 (T3) respectively. Significantly (p< 0.05) highest production was found in T3.Asian J. Med. Biol. Res. September 2016, 2(3): 429-435
Highlights
Freshwater fish production has always been dominated by carps (71.9 percent, 24.2 million tones, in 2010) (FAO, 2012)
The main carp species cultivated in the world are primarily seven in number and are often grouped on the basis of their natural geographical occurrence: the so-called Chinese carps which include the grass carp (Ctenopharyngodon idella), the silver carp (Hypophthalmichthys molitrix) and the bighead carp (Aristichthys nobilis), and the so-called Indian major carps which include catla (Catla catla), rohu (Labeo rohita) and mrigal (Cirrhinus mrigala)
Water quality parameters Mean levels of physico-chemical parameters over the 35 days nursing of spawn are presented in Table 3 and Figure 1
Summary
Freshwater fish production has always been dominated by carps (71.9 percent, 24.2 million tones, in 2010) (FAO, 2012). Aquaculture in Bangladesh has rapidly progressed in recent years with a contribution of 44% to the annual fish production (Talukdar et al, 2012). In 2010-11 fiscal year carp species comprises 34.61% of the total fish production (DoF, 2012). The seventh species is the common carp (Cyprinus carpio). Cyprinus carpio is an important freshwater fish cultured in Asia, in India Pakistan and Bangladesh. From the beginning the rivers were the major source of carp seed production in Bangladesh. Millions of eggs and spawns were collected from the rivers during monsoon (May-August). The due to the destruction of natural availability of carp seed the aquaculture venture has become dependent on the
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