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Comparison of Fingerling Growth Rates and Survival of Two Pangasius Species

M. Khalilur Rahman
Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh.

J. N. Akhter
Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh.

M. A. Mazid
Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh.

G. C. Halder
Fisheries Research Institute, Riverine Station, Chandpur, Bangladesh.

Abstract/ Executive Summary:

Two species of riverine catfish, Pangasius sutchi and pangasius pangasius fingerling of size 7.5 +07 cm in length and 15.5+2.89 in weight were reared in the freshwater ponds under identical management practices. Significantly higher growth rate but lower survival were recorded in the case of P. sutchi fingerling compared to P. pangasius.

Keywords: Pangasius, Fingerling, Comparison, Growth rates and survival, Pangasius species

Location: Riverine Station, Fisheries Research Institute, Chandpur, Bangladesh.

Start Date: 00-04-1991

End Date: 00-05-1991

Program Area: Variety and Species

Commodity: Pangus

Objectives:

To generate reliable data on these aspects, for the two species of Pangasius.

Methodology:

Larvae e of the P. sutchi was imported from Thailand and P. pangasius was collected from the Meghna river near Chandpur ghat by box trap. The experiment was carried out for a period months from April to May, 1991 in the freshwater ponds of the Riverine Station, Fisheries Research Institute, Chandpur, Bangladesh.

The fingerling growth and survival experiments were conducted with two months old fingerlings, 7.5±0.7 em in length and 15.5±2.8g in weight. At this stage, the fingerlings readily accepted artificial feed. Two ponds of 0.05 ha size were used for the experiment for each species. Each pond was stocked with 200 fingerlings. Thus the stocking density was 4,000 ha-^I. Prior to stocking fish, the ponds were cleared off and undesirable fishes by repeated netting and complete dewatering. After dewatering, the two ponds were treated with lime and rotenone at the rate of 400 kg ha^-I and 3.0 mgl^-1 respectively. The ponds were then filled with pond water. The fingerlings were released in ponds after 15 days of lime and rotenone treatment.The fingerlings were fed with a non-pelleted supplemental feed at a rate of 10% (wet weight basis) of their body weight daily. The required quantity of mustard oilcake was soaked in water for 24 hours before mixing with other ingredients. The feed was administered on two trays placed at 0.5m depth at two opposite corners in each pond. No fertilizer was used during the culture cycle. Twenty percent of the total stock was sampled fortnightly in each pond by using a seine net and the total length (cm) and weight (g) of fishes were recorded. Data for water criteria was recorded. The experiment was terminated on the 60th day. The growth data were analysed following the ANOVA test at 5% level of probability.

Source of Information: J. Inland Fish. Soc. India 24(2) 1992, 40-44

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The data on the growth performance of two Pangasius species is given P. sutchi recorded higher growth than that of P. pangasius. The average weight of P. sutchi increased from 15.5±2.8g to 98.5±10.2g while that of P. pangasius increased from 15.5±2.8g to 80.5±8.8g with the survival rate of 84 and 95%, respectively. No sign of disease or natural mortality was observed during the experimental period.The survival rate of P. pangasius was significantly higher than that of exotic P. sutchi. The low survival rate of P. sutcbi may be due to the acclimation factor. The total mean increment of fish was 1.38 and 1.08 g day^-1 respectively. The mean increase In total weight of fingerlings of two Pangasius species on the day 15, 30, 45 and 60, respectively is shown. The net mean ,weight gain by P. sutchi was significantly higher than that of P. pangasius. The physico-chemical parameters of pond water during the investigation were found suitable for the culture of Pangasius species. ANOVA test indicated the existence of significant difference in mean growth rates between the fingerlings of two Pangasius species reared under the same stocking density, habitat and management practices (P<0.05). It reveals from the present study that P. sutchi fingerling grew faster but recorded lower survival rate in comparison to the local P. pangasius.

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