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Stocking Density Effects on Growth Indices, Survival and Production of Thai Sharpunti, Barbonymus Gonionotus (cyprinidae: Cypriniformes) Reared in Earthen Ponds

Mustafizur Rahman
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Md. Ruhul Amin
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Subrata Mondal
Department of Fisheries and Marine Bioscience, Jessore University of Science and Technology, Bangladesh

Zannatul Ferdous
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

To test the effects of stocking density on growth, survival and production of Thai Sharpunti (Barbonymus gonionotus) an experiment was carried out for a period of 2 months in 9 earthen ponds (each of 2.0 decimal). Three stocking densities were tested: ponds with 100, 200 and 300 fish per decimal designated as treatment T1, T2, T3 each having three replications that were randomly selected. At stocking, all the fishes were same age group having body weight of 2.05g. Fishes in all the experimental ponds were supplemented with Saudi Bangla nursery feed for the first 29 days and starter-1 feed for days of 30 to 64. Water quality parameters were within suitable range for fish culture. At the expiration of trial period, results showed significant differences (P<0.01) including weight gain, percent weight gain, average daily weight gain and specific growth rate among the three treatments (T1, T2 and T3 respectively), indicating the decrease of growth performance with the increasing stocking density, whereas total fish yield were higher with higher stocking density. The survival rate was estimated highest in T1 compared to other two treatments (T2 and T3). Considering the highest net production the stocking density applied in T3 found best, but more research still needed to further optimize stocking density of Thai Sharpunti in aquaculture ponds. Till then, stocking 300 B. gonionotus fish per decimal will yield a better production to fish farmers.

Keywords: Stocking density, Growth, Production, Barbonymus gonionotus

Location: Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh

Start Date: 00-03-2013

End Date: 00-05-2013

Program Area: Resource Development and Management

Commodity: Fish

Objectives:

To investigate the influence of stocking density on the growth, survival and production of fingerlings reared in ponds with a view of complimenting existing information to assist fish farmers on better culture methods.

Methodology:

Location and Experimental procedure: The present trial was conducted for a period of 64 days from March to May, 2013 in nine experimental pond situated at the Field Laboratory complex, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh. The ponds were rectangular in shape possessed similar size, depth, basin configuration and bottom type. The surface area of each pond was 81 square meter (2 decimal) with an average depth of 1.2 meter. Quick lime (CaO) was applied at the rate of 1kg/decimal. After 7 days of liming, underground water was entered into the pond by pumping. After that, ponds were divided into three treatments (T1, T2, and T3) on the basis of stocking density. In case of T1, Thai sharpunti (B. gonionotus) was stocked at the rate of 100 fish/decimal, in T2 200 fish/decimal and in T3 300 fish/decimal. At stocking, all the fishes were same age group having body weight of 2.05 g. Fishes were fed with commercially available pelleted feed twice times a day once in the early morning and next at afternoon (8:30 a.m. BDT and 5:30 p.m. BDT). The name of feed was Saudi Bangla fish feed from a well-developed fish feed company. Proximate composition of feed was analyzed through the nutrition laboratory, Department of aquaculture in Bangladesh Agricultural University, Mymensingh. At the beginning of experiment, feed was supplied at the rate of 15% of the body weight and gradually it was readjusted from 14%, 12%, 13%, 11%, 10%, 9% and 8% respectively. Each time the feed was broadcasted homogenously to the whole pond. During the study, water temperature, pH and dissolved oxygen (DO) were recorded as 26.5 ± 1.5^oC, 7.3 ± 0.1 and 6.5 ± 0.5 ppm respectively. Evaluation of Growth performances: Periodic sampling of B. gonionotus was carried out to check the general health, growth and survival and to adjust the feeding rate. 30 fishes were randomly collected from each pond using a Berjal and weight of fishes was taken by using a portable balance (Model HI 400EX). Measurement experiences were completed on each sampling day before feeding with appropriate ration. After that, fishes were released back immediately into their respective ponds. Statistical analysis: One way analysis of variance (ANOVA) was used to compare growth rates, survival and production. All data were analyzed using the SPSS (SPSS, Chicago, IL, USA). The Duncan’s test was used to determine differences among treatment means. Differences were considered statistically significant at P<0.01.

Source of Information: International Journal of Fisheries and Aquatic Studies 2015; 2(4): 350-353

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Stocking density had a significant effects on growth, survival and production parameters of Thai sharpunti. However, the relation between fish growth and fish yield was not linear. But the pond with 300 fish/ decimal showed the highest production. Further studies for a longer period with more treatments are also required to find out more appropriate stocking densities and mass seed production techniques of Thai Sharpunti under captive nursery-rearing system.

Knowledge Management: Journal