Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Observation of Fish Production and Availability of Aquatic Inhabitants Under Pen Culture in Chatol Beel Floodplain

Chironjib Singha Samanta
MS Student
Department of Fish Biology and Genetics, Sylhet Agricultural University, Sylhet-3100, Bangladesh

Nirmal Chandra Roy
Professor
Department of Fish Biology and Genetics, Sylhet Agricultural University, Sylhet-3100, Bangladesh

Angkur Chowdhury
MS Student
Department of Fish Biology and Genetics, Sylhet Agricultural University, Sylhet-3100, Bangladesh

Abstract/ Executive Summary:

Present study concerned about the growth and production of fishes and availability of aquatic inhabitants in Chatol beel floodplain under pen culture technology for a period of 135 days. The pen enclosure was made by bamboo-split fence which covering an area about 2.43 ha. A combination of seven fish species–Labeo rohita, Catla, Cirrhinus cirrhosus, Ctenopharyngodon idella, Puntius gonionotus, Aristichthys nobilis and Labeo gonius were stocked in the pen at the ratio of 30:20:25:5:10:5:5 with the stocking density of 6250 fingerings/ha. The gross fish production of pen was 5282.9 kg, which included 4684.9 kg from stocked fish and 598 kg from non-stocked fish. The small indigenous species of fish (SIS) was dominant in the catches of non-stocked fish and total 20 different SIS species belonged to 12 families were being found with varying abundance. A total 9 species of phytoplankton, 5 species of zooplankton, 21 aquatic weeds and 9 taxa of benthic fauna were observed during study period. The net profit was US $ 3532 and cost- benefit ratio was 1:1.8, which delineate that composite fish culture through pen culture technology in floodplain area has immense possibilities for increasing fish production and financial gains.

Keywords: Aquatic inhabitants, Chatol beel, Floodplain, Fish production, Pen culture

Location: Department of Fish Biology and Genetics, Faculty of Fisheries, Sylhet Agricultural University, Sylhet.

Start Date: 00-00-2017

End Date: 00-00-2017

Program Area: Resource Development and Management

Commodity: Fish

Objectives:

The objectives of this study were- to assess the growth and production of different commercially valuable stocked fish and production of non-stocked fish in Chatol beel floodplain by pen culture system, to identify the availability of other aquatic flora and fauna of the selected floodplain and to introduce the local community with the pen culture system and financial benefits compared to the natural dependency.

Methodology:

Study area and study period- The experiment was conducted in a floodplain of Chatol beel situated in Amura Union, Golapganj Upazilla, Sylhet and necessary laboratory work was done inside the post-graduate laboratory of the Department of Fish Biology and Genetics, Faculty of Fisheries, Sylhet Agricultural University, Sylhet. The study was carried out for a period of 135 days, 1 July to 12 November 2017. The name of selected seasonal floodplain was “Kiamor ghat” covering an area of 2.43 ha. The water availability in this floodplain is about 5-6 months generally from July to December. During dry season, this floodplain turned into dry lands and local people used this chunk of land to cultivate paddies and vegetables. However, in wet season of past years, the local people occupied in this area had left this site fallow and generally depended on the local fish production. The average depth of water during July to December ranges from 1.3-2.5 m. The selected floodplain for pen site was connected to the Chatol beel through a channel of 30 m2 (10 m × 3 m). The enclosure- bamboo-split fence (locally called bana) was made with easily available materials such as- Bamboo split, bamboo poles and posts, nylon rope, GI wire, jute rope etc. The diameter of bamboo-split fence was 60 m2 (15 m × 6 m) and installed at the mouth of the channel. The distance between two thin bamboo splits was maintained (≤ 1 cm) to permit the entry of larvae and hatchling of other small indigenous species but prevented the stocked fish from being escaped. Fertilization was necessary to increase the phytoplankton production of the pen. That’s’ why organic fertilizer cowdung @ 5000 kg/ha and lime @ 250 kg/ha were being applied to the pen 10 days before stocking of fish. Healthy seven fish species- Rohu (Labeo rohita), Catla (Catla catla), Mrigal (Cirrhinus cirrhosus), Grass carp (Ctenopharyngodon idella), Sarpunti (Puntius gonionotus), Bighead carp (Hypophthalmichthys nobilis) and Gonia (Labeo gonius) were stocked in the pen at the ratio of 30:20:25:5:10:5:5 with the stocking density of 6250 fingerings/ha. The initial length of fish ranged from 12 to 17 cm and initial average weight was between 15-75 g. A mixture of rice bran (50%), wheat bran (30%) and oil cake (20%) was applied as supplementary feed in the pen @ 3% body weight daily. In fact, equal amount of feed in the form of wet balls was distributed at the four corner of the pen two times in a day. Fish sampling was done fortnightly for feed adjustment. The whole pen including bamboo screen and net was checked regularly. The water quality parameters were measured twice in a month to understand the aquatic condition. Water quality parameters- water temperature, transparency, dissolved oxygen (DO), pH, total dissolved solid (TDS) and level of ammonia were measured by using thermometer (Hg), Secchi disc, Dissolve Oxygen meter (DO- 5509), pH meter (EZDO-6011), TDS meter (EZDO-6031) and Aquasol (AE 307), respectively. In addition, depth of the water body was measured and color of the water was observed carefully. For studying growth and feed management, 10 fishes of each species were sampled randomly twice in a month. The weight was measured by digital balance and length was measured by measuring scale. Growth and production parameters were analyzed by using one way analysis of variance (ANOVA) to compare mean values. The ANOVA was followed by Duncan’s Multiple Range Test (DMRT) at 5% level of significance. The statistical analysis was done by using SPSS version 22 and Microsoft Excel 2010.

Source of Information: International Journal of Fisheries and Aquatic Research, Volume 3; Issue 3; July 2018; Page No. 61-68, ISSN: 2456-7248,

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

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The present experiment revealed that utilization of seasonal floodplains through pen culture technology can be considered very significant in different aspects, mainly for increasing fish production of seasonal floodplains, financial profits and creating employment opportunities. In fact, the composite culture of other indigenous and exotic carp by the help of such a pen can facilitate the increased natural fish production. The natural production was higher compared to the previous year. In respect of growth of fishes, Ctenopharyngodon idella, which is an exotic carp, had the highest weight gain, length gain and specific growth rate than other stocked fishes due to presence of higher amount of aquatic weeds. However, the availability of phytoplankton, zooplankton and weeds were the lowest in the month November, while the number of species of benthic invertebrate was the lowest in October. From the economic estimation, the net profit from the pen and benefit-cost ratio was outstanding, which worth the practice of pen culture technology in unused floodplains. Further study should be carried out by changing stocking density of fish and use of commercial fish feed or quantification of plankton and weed abundance with their relationship to fish growth.

Knowledge Management: Journal