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首页> 外文期刊>Bangladesh journal of fisheries research >Production and economic return in pangasiid catfish (Pangasius hypophthalmus) monoculture and polyculture with siver carp (Hypophthalmichthys molitrix) in farmers' ponds
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Production and economic return in pangasiid catfish (Pangasius hypophthalmus) monoculture and polyculture with siver carp (Hypophthalmichthys molitrix) in farmers' ponds

机译：农民池塘中gas类gas鱼（Pangasius hypophthalmus）的单养和杂种鲤鱼（Hypophthalmichthys molitrix）的生产和经济回报

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摘要

The production of fish and net economic return in pangasiid catfish (Psngasius hypophthalmus) monoculture and polyculmre with silver carp (Hypophthalmichthys molhrix) in farmers' ponds were assessed. The experiment was arranged in three treatments each with three replications. The ponds were stocked with 30,000 fishes per hectare. In treatment 1 (T_1) pangasiid catfish only, in treatment 2 (T_2) pangasiid catfish and silver carp at the ratio of 1:1, and in treatment 3 (T_3) pangasiid catfish and silver carp at the ratio of 2:1 were stocked. At harvest, production of fish was found significantly (p<0.05) different among the treatments, highest in T_1 and lowest in T_2. Though the total biomass production and total economic return was significantly highest in T_1 than in T_2 and T_3, the net economic return was lowest because of the required highest input costs especially for supplemental feed and fingerlings, resulted the highest cost per unit yield (CPY in Tk/kg) in T_1. Highest cost for supplemental feed required in T_1 was due to highest quantity of feed required for the highest number of pangasiid catfish stocked in that treatment. The findings of the present study suggest that though monoculture of pangasiid catfish give higher fish biomass production but polyculture with silver carp is environmentally good and economically profitable.
机译：评估了pan鱼mono鱼（Psngasius hypophthalmus）的单养养殖和养殖者池塘中silver鱼（Hypophthalmichthys molhrix）的鱼类产量和净经济回报。实验被安排在三个重复的三个处理中。池塘每公顷放养30,000条鱼。仅在处理1（T_1）的gas鱼中，在处理2（T_2）的gas鱼和silver鱼的比例为1：1，而在处理3（T_3）中的gas鱼和silver鱼的比例为2：1 。收获时，各处理之间的鱼产量差异显着（p <0.05），在T_1最高，在T_2最低。尽管T_1的生物质总产量和总经济回报明显高于T_2和T_3，但净经济回报却最低，因为所需的最高投入成本，尤其是补充饲料和鱼种的投入成本最高，导致单位产量成本最高（CPY）。 Tk / kg）。 T_1中所需补充饲料的最高成本是由于该处理中放养的pan虾数量最多所需的饲料量最高。本研究的发现表明，尽管pan鱼的单养提高了鱼类的生物量产量，但与silver鱼的混养对环境有益，在经济上有利可图。

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