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Mortality Rate of Fish Seeds (labeo Rohita) During Traditional Transportation System in the Northwest Bangladesh

M. N. Islam
Graduate School of Science and Technology, Biogeochemistry Laboratory, Shizuoka University,836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan Department of Zoology, University of Rajshahi, Rajshahi–6205, Bangladesh

M. A. Hossain
Department of Zoology, University of Rajshahi, Rajshahi–6205, Bangladesh

Abstract/ Executive Summary:

This investigation deals with the mortality rate of fish seeds (Labeo rohita) during traditional transportation system; to evaluate the effects of loading density with time scale under different water medium; temperature effect with relation to fry size and oxygen consumption; and the effect of saline water bath before transportation. Mortality rates were significantly increased with time scale and loading density under different water medium. Higher mortality was observed at 400 g L-1 loading density (river water 82%, pond water 70% and tubewell water 67.5%) than at 200 g L-1 and 300 g L-1 loading density after 24h. Oxygen consumption rate increased significantly with increasing temperature and decreased significantly with increasing fry body weight. Therefore, mortality rate could decrease (22%) if fish fry are bathed in saline water before journey and tubewell water can be use as a medium for long distance transportation.

Keywords: Fish seeds; Oxygen consumption; Transportation.

Location: Anando Matshaw Hatchery, Rajshahi, Bangladesh

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

The present study was conducted to determine the mortality rates and stress level of fish seeds (Labeo rohita) under traditional conditioning process.

Methodology:

Conditioning and preparation for transportation: Fish seeds (fingerlings, 4-10 cm) were obtained from the Anando Matshaw Hatchery, Rajshahi, Bangladesh. For simulation purposes, the fingerlings were conditioned following typical procedures practiced by nursery. First, the fingerlings were transferred from the nursery to the conditioning pond (locally called pakai pond; 40×30 m). After 24 h in the pakai pond, the fingerlings were caught and kept in hapas with manual aeration (water splashing) for 30 min every morning for 3-4 days. After 30 min of aeration, the fingerlings were released back into the pakai pond. The fingerlings were fed wet mustardoil cake daily at 2% body weight, and artificial feeding was stopped 12-24 h before harvesting into the transport vessels. Experimental design: We studied the simulation experiments over 24h under different temperature (20°C, 25°C and 30°C), loading density (200, 300 of 400 g L-1) and fry body weight using different water medium (river, pond and tubewell). Fingerlings (6 kg) were placed into each aluminum vessel (30 L) filled with different water at a different loading density for incubation. 0.9% NaCl solution (table salt 9 g L-1) was used as bathing saline water before transportation. Water temperature was controlled and kept constant by the aquarium cooler. Sampling, measurement and analysis: Measurements of pH, DO and pCO₂ were carried out 6 times per day (4h interval) for 3 replications. Water pH and dissolved oxygen (DO) were measured using a pH meter ORION 4 STAR and calibrated with NIST (NBS)-scaled buffer solutions (Mettler pH 6.865 and 4.008 buffers). Carbon dioxide concentrations were calculated with the program CO2SYS [28] using pH, alkalinity, salinity and temperature data sets. Statistical analysis: The mean values, standard deviation (SD) and correlation coefficient (r) were analyzed by using statistical software. We performed an ANOVA (two-factor without replication) to analyze the variances with 0.05 level of significance.

Source of Information: J. Sci. Res. 5 (2), 383-392 (2013)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

These results indicate that rate of mortality of fish seeds during our traditional transportation system can decrease by following simple procedures. Improvement of conditioning method before transportation can be beneficial for fry survival. Also avoiding high loading density and frequently splashing water for oxygen supply keeps the fry in good condition. Changing water after 1~1.5h during transportation can reduce fry death due to accumulation of toxic wastes. Seeds can be bathed in saline water before transportation to reduce disease and bacterial growth in the transport water. For keeping temperature cool earthen container can be used and tubewell water is good as a medium for long distance transportation.

Knowledge Management: Journal