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Growth Performance and Morphological Variations Among Thai Pangas Pangasius Hypophthalmus Collected from Four Different Hatcheries in Mymensingh, Bangladesh

M. M. R. Khan
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh

M. S. Alam
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh

S. Barua
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh

M. M. H. Bhuiyan
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

Four hatchery populations (Shambhuganj, Brahmaputra, Anudan and Bhai- Bhai) of Thai Pangas (Pangasius hypophthalmus) of Mymensingh region in Bangladesh were analyzed by growth performance and morphological characters. Fifty days growth experiment having three replications of each hatchery produced fries were conducted with supplemental feed. The highest percent gain in length, weight, and SGR were 9.29, 41.18 and 0.68 respectively in case of Shambhuganj population whereas the lowest values of 3.68, 0.85 and 0.02 respectively were given by the Bhai-Bhai population. The Bhai-Bhai population showed deteriorated growth pattern probably due to high inbreeding depressions in the progenies of that population. Four morphometric characters (BDA, PELFL, HL and HW) and 2 meristic characters (AFR and CFR) in Anudan population were significantly (p<0.0001) higher than other three populations. Brahmaputra population was also showed significantly higher for two meristic characters (CFR and PCFR). The results of growth and morphological characters indicated that the broods of Anudan and Brahmaputra populations were highly diversified might be due to using of large effective breeding stocks. The present study suggests that there are strong relationship among growth performance and morphological characters of Thai Pangas, which can be used for the quality determination inferred by genetic diversity.

Keywords: Thai Pangas, Hatchery, Growth, Morphology

Location: Field Laboratory Complex of Fisheries Faculty, Bangladesh Agricultural University, Mymensingh.

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Pangus

Objectives:

To clarify growth and morphological variation of Thai Pangas, P. hypophthalmus using four hatchery populations from Mymensingh region in Bangladesh.

Methodology:

Fries of Thai Pangas were collected from four different hatcheries. After collection of the stocks, they were reared in the newly constructed ponds at the Field Laboratory Complex of Fisheries Faculty, Bangladesh Agricultural University, Mymensingh. The area of each pond was 9.5 x 6.1x 0.8 m³ and the fishes were stocked at the density of 100 fingerlings pond^-1. Twenty individuals from each population were randomly collected and morphological characteristics were studied for each individual. Four newly constructed small (9.5 x 6.1 x 0.8)m³ rectangular ponds with outlet and inlet facilities were used for the growth study of P. hypophthalmus. The experiment was carried out for fifty and sampling was done at 10 days interval to record gain in length (cm) and in weight (g). The experimental ponds were fenced by nylon net with the help of bamboo sticks to ensure confirming the experimental fishes in their respective ponds even if the ponds get inundated due to over raining. Lime at the rate of 1kg/ decimal was applied to all the experimental ponds. Ten days after liming cow dung at the rate of 20 kg/decimal was applied to all the experimental ponds. Ponds were then fertilized with urea and triple super phosphate (TSP) at the rate of 1 kg/decimal 10 days before fingerling stocking. Netting was done to remove juvenile frogs and water bugs from the experimental ponds 3 days before fingerling stocking. Fries of four hatcheries were stocked separately in four different earthen ponds after conditioning and each pond divided by three net cage (3.0 x 5.0 x 0.8) m³having three replications of each population. Each replication contained with 30 fries (average length, 11.25 ± 0.957 em and weight, 71.25 ± 2.217 g). A common supplemental feed containing 30% fishmeal, 10% wheat bran, 20% rice bran, 10% soybean meal and 20% mustard oil cake was administered at the rate of 5% of body weight to all the stocked fishes. In the present study, the approximate protein and fat level were maintained in the feed according. The required quantities of mustard oil cake was soaked overnight with tap water and mixed with all the ingredients with water in such a way to make it into small balls. The experimental fish were fed 5% of their body weight twice in a day at 0930 and 1730 hrs through putting the balls directly into the ponds. The quantity of feed was adjusted every 10 days on the basis of increments of the average body weight of the stocked fishes. The effect of genetic potentiality on the growth under the same feeding strategy was assessed by recording the rate of growth in terms of gain in length (cm) and in weight (g) of fish every ten days. The length and weight were recorded by random sampling of 20 fish from each pond by using a small seine net. Weight was taken with a HL-400 compact scale (HL-EG, X-01, 0-400g) and length with a measuring scale. One way analysis of variance (ANOV A) was used to determine the effect of growth (percent gain in length and percent gain in weight) in three treatments of each hatchery population fries and specific growth rate (SGR%BW^d-1). This was done by following Duncan's New Multiple Range Test to identify the level of significance of variance among the hatchery populations.

Source of Information: Progress. Agric. 15(1): 141-149, 2004,ISSN 1017-8139

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Among the four populations, Shambhuganj and Anudan populations showed significantly higher growth than the other two populations. The highest percent gain in length and weight, and SGR were 9.29, 41.18 and 0.68 respectively in case of Shambhuganj population whereas the lowest values of 3.68, 0.85 and 0.02 respectively were given by the Bhai-Bhai population. The Bhai-Bhai population showed deteriorated growth pattern probably due to high inbreeding depressions in the progenies of that population. In morphological study, four morphometric characters (BOA, PELFL, HL and HW) and two meristic characters (AFR, CFR) of the Anudan population were significantly higher (p<0.0001 ) than those of other three populations. Brahmaputra population also showed significantly higher values in two meristic characters (PCFR and CFR). The present study suggests that there are strong relationship among growth performance and morphological characters of Thai Pangas, which can be used for the quality determination inferred by genetic diversity.

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