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Studies on the Growth, Survival and Production of Endangered Mahseer, Tor Putitora (hamilton, 1822) at Different Stocking Densities in Primary Nursing

Mt. Shamima Yasmin
Department of Fisheries, Bangladesh

M Shadiqur Rahman
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

KM Abdul Halim
Department of Fisheries, Bangladesh

M Alam Khan
Index Fisheries Limited, Bangladesh

Farida Yeasmin
Department of Fisheries, Bangladesh

KM Hasanuzzaman
Department of Fisheries, Bangladesh

SK Dabnath
Department of Fisheries Technology, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M Mamunur Rahman
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M Rafiqur Rahman
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

The research work was conducted in six nursery ponds of 0.01 ha each with 4 days old mahseer, Tor putitora spawn at three different stocking densities viz., 1.50, 1.75, and 2.00 million spawn/ha each having two replicates. Fries were fed the same diet of MEGA fish feeds in three different treatments containing 40.57% crude protein (pre-nursery feed) for the first 14 days and 35.52% crude protein (nursery feed) for the second 14 days. The feeding rate was 20 kg/ million spawn/ day for the first 2 weeks and 24 kg/ million spawn/ day for the second 2 weeks. The Physico-chemical characteristics of pond water were measured weekly. The mean values of some water quality parameters such as temperature (°C) were 22.50±0.35 (T₁), 22.69±0.39 (T₂), 22.81±0.37 (T₃); transparency (cm) 28.38±2.00 (T₁), 41.88±2.45 (T₂), 52.25±1.93 (T₃); dissolved oxygen (mg/l) 4.90±0.21 (T₁), 4.42±0.15 (T₂), 3.72±0.07 (T₃); pH 7.34±0.22 (T₁), 7.21±0.23 (T₂) 7.53±0.21 (T₃) and alkalinity (mg/l) 92.38±3.06 (T₁), 112.13±6.48 (T₂), 117.38±5.75 (T3) from 28 days, respectively. The ranges of water quality parameters were suitable for fry and fingerling rearing. The highest weight gain was recorded in T₁ (1.79±0.03) and the lowest in T₃ (1.46±0.04). The mean value of final weight (g) was 1.81±0.02, 1.71±0.02, and 1.52±0.03 in T₁, T_2, and T₃, respectively. A significantly lower specific growth rate was found in T₃ (7.23±0.04) than T₁ (7.54±0.02) and T₂ (7.45±0.02). Fingerlings in T₃ produced a significantly higher food conversion ratio (0.61±0.10) than T₁ (0.44±0.07) and T₂ (0.48±0.04). The survival rate of mahseer was 63.05±0.59% (T₁), 60.38±0.51% (T₂), and 55.19±0.70% (T₃), respectively. A significantly higher number of fingerlings was produced in T₃ (1103700±10608) than T₁ (945675±9320) and T₂ (1056650±10314), respectively. But the simple cost-benefit analysis showed that higher net benefits were obtained in T₂ (TK. 13, 09,968) where the ponds stocked with 1.75 million spawn/ha. Hence, it seems that, among the three tested stocking densities, 1.75 million spawn/ha is the most efficient stocking density for primary nursing of mahseer spawn.

Keywords: Tor putitora, Primary nursing, Densities, Growth, Survival, Production

Location: Baraigoan under Trishal Upazila, Mymensingh, Bangladesh.

Start Date: 04-01-2017

End Date: 31-01-2017

Program Area: Resource Development and Management

Commodity: Fish

Objectives:

To establish an appropriate culture technology for nursing and rearing of T. putitora to ensure quality and regular supply of fingerlings.

Methodology:

Study area and experimental design- The experiment was conducted in farmer’s ponds of Baraigoan under Trishal Upazila, Mymensingh for a period of 4 weeks from 4 January 2017 to 31 January 2017 in six earthen nursery ponds. All the ponds were rectangular in size and shape and the surface area of each pond was 0.01 ha with an average water depth of 3 feet. Three treatments differing in stocking densities of spawn viz., 1.50 million spawn/ha (T₁), 1.75 million spawn/ha (T₂), and 2.00 million spawn/ha (T₃) were tested with two replicates each. Pond preparation, stocking, and management- At first, the water of the experimental ponds were drained out and all fish species and aquatic vegetations were removed. After drying, pond bottoms were treated with quicklime (CaO) at the rate of 250 kg/ha to kill harmful animals and pathogens. All the ponds were then filled with groundwater at a depth of about 3 feet. The pond water was sprayed with dipterex (1.0 ppm) to eradicate harmful insects and predatory zooplankton. One day after the application of dipterex, 4-day-old spawn having an average length of 1.15±0.13 cm and weight of 0.014±0.02 g were stocked in the experimental ponds. Spawn was fed three times (8:30 am BDT, 1:00 pm BDT, and 5:00 pm BDT) daily with MEGA pre-nursery feed for the first 14 days and nursery feed for days 15 to 28. The rate of feeding was 20 kg/million spawn/ day for the first 2 weeks and 24 kg for the second 2 weeks. Spawn was sampled weekly by seining with a fine-meshed net for the assessment of growth and health condition. Physico-chemical parameters of pond water- Physico-chemical parameters of pond water were monitored weekly between 09.00 and 10.00 hr. Temperature (°C) and dissolved oxygen (mg/l) were determined directly by a digital water quality analyzer Hanna DO meter (Model-HI 9146, Romania), pH by a digital pH-meter (Milwaukee pH meter, Model-PH55/PH56, USA), and transparency (cm) by a secchi disc. Total alkalinity was estimated following the standard method. Growth performance, survival, production, and feed utilization of T. putitora- After 4 weeks of nursing, the spawn were harvested by repeated netting, followed by drying the ponds. The live fingerlings were counted and weighed individually. Survival (%) and production (kg/ha) of spawn were then estimated and compared among the treatments. The following formulae have been used to determine the specific growth rate (SGR% per day), survival rate (%), food conversion ratio (FCR), and production of T. putitora fry. Statistical analysis- The mean values for growth, survival, production, and water quality parameters of different treatments were tested using one-way analysis of variance (ANOVA) followed by Duncan’s Multiple Range Test. The statistical analysis was performed by SPSS software 19 (SPSS, USA). The level of significance was set at 0.05%. A simple cost-benefit analysis was done to estimate the net benefits from different treatments.

Source of Information: International Journal of Fisheries and Aquatic Studies; 2019; 7(5): 194-199

Article Link (Online Journal): www.fisheriesjournal.com

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The presented study revealed that the survival, growth, and production of fry were inversely related to the stocking densities of spawn but the net benefits recorded in the ponds where the stocking density was the lowest than other ponds. So, it can be concluded that the stocking density of 1.75 million spawn/ha may be advisable for the rearing of mahseer fry for 4 weeks in primary nursing. On the other hand, the production of sufficient and quality fingerlings through the application of our present findings might have important implications for the protection of mahseer from extinction.

Knowledge Management: Journal