Abstract
An experiment was carried out during April to September 2013 to compare the reproductive performance of freshwater prawn golda (Macrobrachium rosenbergii) broodstocks fed on diets including 3 commercial (Mega -F1, SABINCO- F2 and CP- F3) and a laboratory formulated test feed (F4). Post larvae (PL) were collected from the river Kocha of district Pirozpur in April 2012 and nursed in the hapa (net cage) then reared in earthen ponds at the Fisheries Field Laboratory, Bangladesh Agricultural University (BAU), Mymensingh. The broods were fed with selective feeds since their PL stage. The feeding was continued till their maturity of both male and female up to berried females. The proximate composition of the feeds, F1 where crude protein, 33.49%, lipid 5.38%, carbohydrate 30.31%, F2-crude protein, 26.70%, lipid 5.50%, carbohydrate 34.34%, F3- crude protein, 38.90%, lipid 8.09%, carbohydrate 25.37% and treatment F4- crude protein 33.00%, lipid 11.13%, carbohydrate 25.43%. Feeds were supplied at 5% body weight twice at dawn (5:30-6:00 am) and dusk (5:30-7:30 pm) till the end of the experiment. The variation in most water quality parameters, temperature, alkalinity, DO, transparency, TDS, conductivity NO2 --N, PO4 - 3 and chlorophyll-a were insignificant; while parameters, water depth, pH, NH3-N and NO3 --N was found to vary significantly (p<0.05) among treatments. Brood observation was carried out by dragging seine net or/and hand picking for eggs in egg chamber remained intact. The male and female ratio estimated 1:2.8, 1: 2.4, 1: 2.4 and 1: 1.7 in the treatments F1, F2, F3 and F4. The weight of the berried females was 56.33±19.55 g, 85.50±14.85 g, 73.67±23.09 g and 94.50±51.62 g; total weight of eggs was 7.61±1.86g, 7.04±0.69 g, 10.26±1.41g and 6.15±1.20 g in F1, F2, F3 and F4. The estimated numbers of eggs were 53,889±10,541, 37,555±1,217, 59,640±5,270 and 36,017±7,790 in F1, F2, F3 and F4 respectively. The weight of berried females with eggs (g), total eggs (g) and estimated number of eggs were significant (p<0.05) among treatments. Females fed with commercial feed F3 (CP) were found to produce the sufficient number of eggs (59,640/female) followed by F1 (Mega). The findings may contribute to the better broodstock management of freshwater prawn to produce of a sufficient number of embryonic eggs for hatchery operation.J. Bangladesh Agril. Univ. 14(2): 229-234, December 2016
Highlights
Freshwater prawn (Macrobrachium rosenbergii, De Man 1879) locally known golda is one of the important aquaculture species in Bangladesh
Since culture practices began in the country, the seed of freshwater prawn i.e., post larvae (PL) were largely collected from wild sources (Ahmed 2008)
The experiment was carried out during April to September 2013 to compare the reproductive performance of freshwater prawn Golda (Macrobrachium rosenbergii) broodstocks fed on four diets including 3 commercial (Mega -F1, SABINCO- F2 and CP- F3) and a laboratory prepared test feed (F4)
Summary
Freshwater prawn (Macrobrachium rosenbergii, De Man 1879) locally known golda is one of the important aquaculture species in Bangladesh. Since culture practices began in the country, the seed of freshwater prawn i.e., post larvae (PL) were largely collected from wild sources (Ahmed 2008). Due to the rapid extension of cultural practices, in many parts of the world, a huge number of PL were collected from nature (Mohanta 2000) and concerning the biodiversity conservation, exerted ban in many countries including Bangladesh. Development of a large scale brood in captive conditions with proper nourishment is prerequisite for quality seed production. An attempt was taken to develop a suitable feeding regime using locally available commercial and laboratory prepared feeds for the proper nourishment of quality berried females for hatchery operations
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