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Inventory of Ichyofaunal Diversity, Fishing Gear and Craft in Turag River, Dhaka, Bangladesh

Naser Ahmed Bhouiyan
Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh

Mohammad Abdul Baki
Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh

Anirban Sarker
Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh

Md. Muzammel Hossain
Department of Zoology, Jagannath University, Dhaka-1100, Bangladesh

Abstract/ Executive Summary:

The biodiversity of many Bangladesh Rivers is seriously threatened by industrial and municipal pollution. The study was conducted in the Turag River starting from Amin Bazar bridge (23°47’ N 90°20’E) to Kamarpara bridge (23°53’ N 90°23’E). This inventory survey was sampled at a fortnightly interval usually between 7.00 am to 5.00 pm by a team using a boat from December 2012 to November 2013. Detailed information on catch by species, fish length and weight, different types of gear and craft were collected through direct observation. A total of 71 (65 indigenous and 6 exotic) fish species (under 25 families of 9 orders) have been identified. 17 different types of gears of two categories (active and passive gear) and 8 different types of crafts were observed to harvest fish in the study area. The survey revealed that rising floodwater stimulated an increase in fishing activities in the study area from July to October. Fish numbers were recorded lower from November to July (dry and pre-monsoon period) likely due to reduced water flow and adverse water quality of this river. A paired t-test indicate that fish species numbers were significant different between Dry and pre-monsoon (P=0.02), Dry and monsoon (P=0.02) and Dry and post-monsoon season (P=0.03) respectively. However, fisheries resources contribution is very limited for livelihood of the surrounding people.

Keywords: Fish species, Fishing activity, Flood water, Water quality, Extinct

Location: the Turag River in Bangladesh

Start Date: 00-12-2012

End Date: 00-11-2013

Program Area: Conservation and Biodiversity

Commodity: Craft, Fishing gears

Objectives:

The objective of this study is to assess the ichyofaunal diversity of River Turag. We will classify fish species, how seasonal changes in water level impact the
diversity of species.

Methodology:

The Turag is 75 km long of which only about 18.4 km are within the study area starting from Amin Bazar bridge (23°47’ N 90°20’E) to Kamar para bridge (23°53’ N 90°23’E). Turag is the upper tributary of the Buriganga, a major river in Bangladesh. Turag River is supposed to derive massive pollutant loadings from industrial effluents directly as industries, textiles, dyeing and pharmaceuticals have clustered here. There are numerous canals, channels, and pipes directly discharging industrial, municipal and domestic sewage into the Turag, these observed by our study period. During the monsoon season, the water quality improves moderately, but on the advent of the dry season, pollution concentration increases abruptly because the water level of the rivers reduces a lot at this time, but the rate of pollutants released into the rivers remains identical. This inventory survey work of the Turag River was sampled inside at fortnightly interval for a total of 12 months from December 2012 to November 2013. A team of two biologists carried out a continuous survey using a boat. Detailed information on catch by species and different types of gear and craft were collected while fishermen were harvesting fish in the river. The survey procedure also included recording individual fish length and weight. Survey was usually made between 7.00 am to 5.00 pm. Materials were included digital camera, measuring tape, spring balance, polythene bags, data sheet, pencil, rubber band, map and other field logistics. The samples were photographed, immediately prior to preservation. The fish specimens caught by each fishing gears were also recorded separately. Fish identification, common and scientific names used throughout this study are in accordance with pictorial books and gear identified by Ahmed N. Fish species were divided into three categories according to which are define below. Riverine: Species usually found in rivers and estuaries throughout their life cycle with no dependence on the floodplain, although some of these species can be found more extensive floodplains. Migratory: Species which move between river and floodplain during different stages in their life cycle. It remains unclear whether such movements are obligatory for their survival. Floodplain resident (sedentary): Species which are generally sedentary and are capable of surviving in the perennial waters on the floodplain throughout the year. Many of these species also inhabit a variety of other habitats including large rivers. Hydrological year Hydrological year can be divided into four seasons. Rising flood (pre-monsoon): May-June. Full flood (monsoon): July- September. Flood drawdown (post-monsoon): October-November. Dry season (winter): December-April. Bangladesh Water Development Board (BWDB) set up a water level monitoring station at Turag River for forecasting the flood situation of Dhaka city. This station was located at 23°78’33’’ and N 90°34’E for the daily monitoring of the water level of Turag River which included a staff gages. Therefore, this study collected the daily water depth data during study period from BWDB office, 72 Green Road, Farmgate, Dhaka, Bangladesh. Bangladesh metrological department showed that pre-monsoon, monsoon, post-monsoon and dry period in 2013 received average rainfall in Dhaka city was 339.9, 330.0, 103.35 and 54.3 mm respectively. Statistical analysis We used a paired t-test to test whether the fish species number in different seasons were significantly different between dry season and pre-monsoon, dry season and monsoon, dry season and post-monsoon or not. Correlation analysis was also done among water depth, fish species and fishing activity.

Source of Information: Fish Aquac J, an open-access journal Volume 7, Issue 2, 1000165; ISSN: 2150-3508

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In conclusion, this study provides the first basic and baseline information on ichyofaunal diversity, fishing Gear and Craft in the Turag river that would be beneficial for fishery biologists and conservationists to impose adequate regulations for sustainable fishery management and conservation of biodiversity for the river as well as for other rivers in Bangladesh.

Knowledge Management: Journal