Harunur Rashid
Professor of Aquatic Ecology.
20+ years of teaching experience at Undergraduate and Postgraduate levels including MSc & PhD supervision.
RESEARCH INTERESTS
a. Aquatic Ecology
b. Aquatic Pollution
c. Climate Change Impacts
ONGOING RESEARCH Projects: related to-
a. Pesticide Pollution
b. Stress Ecology in Aquatic Systems
c. Microplastics Pollution
COURSES TAUGHT
a. Ecology
b. Water Management
c. Environmental Pollution & Toxicology
d. Global Climate Change
e. Oceanography
Website: http://harunurrashid.net
Address: Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, BANGLADESH
20+ years of teaching experience at Undergraduate and Postgraduate levels including MSc & PhD supervision.
RESEARCH INTERESTS
a. Aquatic Ecology
b. Aquatic Pollution
c. Climate Change Impacts
ONGOING RESEARCH Projects: related to-
a. Pesticide Pollution
b. Stress Ecology in Aquatic Systems
c. Microplastics Pollution
COURSES TAUGHT
a. Ecology
b. Water Management
c. Environmental Pollution & Toxicology
d. Global Climate Change
e. Oceanography
Website: http://harunurrashid.net
Address: Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, BANGLADESH
less
InterestsView All (10)
Uploads
Papers
treatments I, II and III were 57.08 ± 1.35, 8.80 ± 0.09 and 77.29 ± 3.72, 12.88 ± 0.74 and 98.93 ± 1.61, 16.16 ± 1.75 (x103) cells L-1, respectively. The net and gross fish productions of the ponds under treatments I, II and III were 0.85 and 3.11 t ha-1 yr-1 and 1.32 and 3.58 t ha-1
yr-1 and 1.85 and 4.11 t ha-1 yr-1, respectively. Fish production under treatment III was better than those under treatments I and II because plankton population densities under treatment III was the highest. Therefore, the mixed fertilization is suitable for production of plankton that enhance growth and production of fishes.
OPPs may contaminate surrounding aquatic environments through several routes including spray drift, surface runoff and groundwater leaching. Since it is unknown how much OPP end ups in aquatic environment in Bangladesh, the objectives of the present study were to quantify the residues of ten most
commonly used OPPs in water and sediment of water bodies of north-west Bangladesh and to assess
their ecological risks for aquatic organisms. The risks of the pesticides in surface water and sediment
were assessed using a first-tier risk quotient (RQ) approach. The higher-tier PERPEST model was used to
refine the ecological risks of pesticides when RQ indicated a potential risk. Results showed the most
frequently detected pesticides that appeared in high concentrations were chlorpyrifos, diazinon and
quinalphos in surface water and sediment. The highest concentration of OPPs measured in water was
9.1 mg chlorpyrifos/L (median of 1.95 mg/L), while this was 51 mg diazinon/kg dw (median of 11 mg/kg dw)
for sediment. Furthermore, results showed high acute and/or chronic RQs (RQ > 1) in surface water and
sediment for chlorpyrifos, diazinon, quinalphos, malathion and fenitrothion. The higher-tier PERPEST
model confirmed risks of chlorpyrifos, diazinon, quinalphos and fenitrothion for aquatic insects, microand macro-crustaceans which were previously derived by RQ-based risk assessment for aquatic organisms. Furthermore, the results of the PERPEST model also indicated possible indirect effects of these
pesticides on algae and macrophytes, community metabolism, rotifers and other macro-invertebrates.
Recently, abundance of this species in nature has been declined due to heavy fishing pressure, habitat destruction, aquatic pollution and indiscriminate use of pesticides in crops. Now, it is an endangered fish species of Bangladesh (IUCN Bangladesh, 2003). Despite the increasing demand and decreasing production of the fish in nature, it is high time to think about the commercial production of mud eel because there are lots of opportunities to culture it in shallow and small ponds, ditches, tanks or cisterns. Some people are trying to culture this fish but availability of fingerling in nature is less and no commercial hatchery is yet to produce the spawn or fingerling of mud eel. These are the big obstacles to proceed further with the commercial production of mud eel. Although initiatives have already been taken for artificial breeding and culture of the fish in captivity but no transferrable technology has yet been developed. Lack of knowledge and information on reproductive biology of mud eel are the most important constraints. Therefore this study was undertaken at Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, to develop captive breeding protocol of mud eel.
treatments I, II and III were 57.08 ± 1.35, 8.80 ± 0.09 and 77.29 ± 3.72, 12.88 ± 0.74 and 98.93 ± 1.61, 16.16 ± 1.75 (x103) cells L-1, respectively. The net and gross fish productions of the ponds under treatments I, II and III were 0.85 and 3.11 t ha-1 yr-1 and 1.32 and 3.58 t ha-1
yr-1 and 1.85 and 4.11 t ha-1 yr-1, respectively. Fish production under treatment III was better than those under treatments I and II because plankton population densities under treatment III was the highest. Therefore, the mixed fertilization is suitable for production of plankton that enhance growth and production of fishes.
OPPs may contaminate surrounding aquatic environments through several routes including spray drift, surface runoff and groundwater leaching. Since it is unknown how much OPP end ups in aquatic environment in Bangladesh, the objectives of the present study were to quantify the residues of ten most
commonly used OPPs in water and sediment of water bodies of north-west Bangladesh and to assess
their ecological risks for aquatic organisms. The risks of the pesticides in surface water and sediment
were assessed using a first-tier risk quotient (RQ) approach. The higher-tier PERPEST model was used to
refine the ecological risks of pesticides when RQ indicated a potential risk. Results showed the most
frequently detected pesticides that appeared in high concentrations were chlorpyrifos, diazinon and
quinalphos in surface water and sediment. The highest concentration of OPPs measured in water was
9.1 mg chlorpyrifos/L (median of 1.95 mg/L), while this was 51 mg diazinon/kg dw (median of 11 mg/kg dw)
for sediment. Furthermore, results showed high acute and/or chronic RQs (RQ > 1) in surface water and
sediment for chlorpyrifos, diazinon, quinalphos, malathion and fenitrothion. The higher-tier PERPEST
model confirmed risks of chlorpyrifos, diazinon, quinalphos and fenitrothion for aquatic insects, microand macro-crustaceans which were previously derived by RQ-based risk assessment for aquatic organisms. Furthermore, the results of the PERPEST model also indicated possible indirect effects of these
pesticides on algae and macrophytes, community metabolism, rotifers and other macro-invertebrates.
Recently, abundance of this species in nature has been declined due to heavy fishing pressure, habitat destruction, aquatic pollution and indiscriminate use of pesticides in crops. Now, it is an endangered fish species of Bangladesh (IUCN Bangladesh, 2003). Despite the increasing demand and decreasing production of the fish in nature, it is high time to think about the commercial production of mud eel because there are lots of opportunities to culture it in shallow and small ponds, ditches, tanks or cisterns. Some people are trying to culture this fish but availability of fingerling in nature is less and no commercial hatchery is yet to produce the spawn or fingerling of mud eel. These are the big obstacles to proceed further with the commercial production of mud eel. Although initiatives have already been taken for artificial breeding and culture of the fish in captivity but no transferrable technology has yet been developed. Lack of knowledge and information on reproductive biology of mud eel are the most important constraints. Therefore this study was undertaken at Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, to develop captive breeding protocol of mud eel.
Ad you may be interested in
Methodology: For induced breeding through environment manipulation, breeding pits were constructed inside 4 and 6 m2 cement cisterns. Breeding pit was constructed into a 50 cm thick mud cum organic material (decomposed/semi-decomposed) mixture on the cistern floor composed of five layers (10 cm each; bottom up order) viz. blackish mud from rice field, dried water hyacinth-straw mix, finely chopped banana trunk, decomposed cow dung and mud. This pit was constructed with sloped edges, attached with two cistern walls and occupied around half the area of the cistern. Water was added to maintain a 15 cm layer above the pit top (for a week) to allow the organic materials decomposed. After one week, upon appearance of foam on top, water was drained out and the pit was filled-up with same amount of water again. This process was repeated for at least five weeks until no foam appears. Cistern was then introduced with water hyacinth and a water depth of 25 cm (from the cement cistern bottom) was then maintained thought the spawning season. Mature and domesticated cuchia breeders were then released (during mid-March) into cement cisterns (4 and 6 m2) with breeding pits inside at following densities and sex ratios – 2/m2 at 1:1 (T1) and 1:2 (T2) male to female (cistern size 4 m2), 3/m2 at 1:1 (T1) and 1:2 (T2) male to female (cistern size 4 m2), 4/m2 at 1:1 (T1) and 1:2 (T2) male to female (cistern size 6 m2). Fish husbandry was done following standard protocol and cuchia were fed mostly with live feed. Breeders were then kept undisturbed and allowed to form pairs and breed naturally inside the breeding pits for a period of three and a half months.
Results: During early July, breeding pits were observed keenly to find out any sign of breeding holes constructed by cuchia breeders. One breeding hole per pit was observed in case of T1, T2 and T4; T3 and T6 had 2 holes each; and T5 had highest 3 holes. Numbers of fry collected were 133, 249, 284, 157, 419 and 547 from T1, T2, T3, T4, T5 and T6, respectively. The highest numbers of fry were obtained from the breeding pit constructed in 6 m2 cistern, released with 4 cuchia breeder/m2 and at 1:2 male to female ratio.