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Uddin S.A.,Chittagong University | Abdul Kader M.,Chittagong University | Nurul Azim Sikder M.,Chittagong University | Abdul Hakim M.,Chittagong University | And 3 more authors.
Ribarstvo, Croatian Journal of Fisheries | Year: 2013

Currently, antibiotics are widely used in shrimp hatcheries to control bacterial infections. Appearance of antibiotic resistant pathogens and restriction on the use of antibiotics have led to the development of alternatives to antibiotics in hatchery systems. In light of this, an attempt was undertaken to investigate the effects of probiotics on the larval rearing of Penaeus monodon, compared with the control tanks (without probiotics). The results showed that several issues significantly improved with administering probiotics in the experimental tanks compared with the tanks without probiotics. For example, the concentration of ammonia was estimated to be 1.25 mg/L which was less than a half of what was measured in the control tanks. The size variation was observed more in the control tanks than in the experimental tanks. Moreover, the muscle gut ratio of PL15 was about 85 to 92% in the probiotic treated tank and 70 to 80% in the control tank during the eight cycles of production. The fouling organisms were more in the control tank compared to the experimental tanks. The average length of PL15 was maximum when reared in the experimental tanks compared to the control tanks. The final survival rate of PL15 from the control and experimental tank was 35 and 52%, respectively. The present investigation indicated that probiotics played an important role in the growth, survival and health status of P. monodon larvae. Source

Salam M.A.,Bangladesh Agricultural University | Shahjahan Md.,Bangladesh Agricultural University | Sharmin S.,Bangladesh Agricultural University | Haque F.,Bangladesh Agricultural University | Rahman M.K.,Bangladesh Fisheries Research Institute
Pakistan Journal of Zoology | Year: 2015

Toxicological effect of an organophosphorous pesticide sumithion was studied in common carp, Cyprinus carpio. Acute toxicity of sumithion (96 h LC50 value 8.05 ppm) was first determined. Then the fish were exposed to three sub-lethal concentrations (0.8, 1.6 and 3.2 ppm) of sumithion for 24, 48, 72, and 96 h, at the end of which blood glucose levels and hematological parameters were analyzed. The blood glucose level increased significantly in higher concentrations (1.6 and 3.2 ppm) compared to control (0 ppm) during the toxicity of sumithion. On the other hand, the hemoglobin, RBC and hematocrit values declined significantly with the increasing concentration of sumithion. The MCV and MCH showed significant increases in higher concentrations. The present investigation revealed that sumithion has adverse effects on the biochemical and hematological parameters, which might alter physiological functions in the fish body. Copyright 2015 Zoological Society of Pakistan. Source

Hossain M.Y.,University of Rajshahi | Islam R.,University of Rajshahi | Hossen M.A.,University of Rajshahi | Rahman O.,University of Rajshahi | And 3 more authors.
Ribarstvo, Croatian Journal of Fisheries | Year: 2015

Long whiskers catfish Mystus gulio is a commercially important food fish in Asian countries. But natural population is decreasing due to over-exploitation and various ecological changes in its natural habitats. This paper suggests the steps for the conservation of the remnant isolated population of M. gulio in Asian countries. ©The Author(s) 2015. Source

Mofasshalin M.S.,University of Rajshahi | Bashar M.A.,University of Rajshahi | Bashar M.A.,Bangladesh Fisheries Research Institute | Alam M.M.,University of Rajshahi | And 4 more authors.
Asian Journal of Animal and Veterinary Advances | Year: 2012

The present study attempts to describe the parasitic infestations of three Indian minor carps (Labeo bata, Labeo gonius and Cirrhinus reba) collected from different fresh water bodies of Rajshahi district, Bangladesh during March 2007 to February 2008. A total of 480 host fishes were examined of which 370 fishes were infected by 4 protozoan (Trichodina sp., Ichthyophthirius sp., Apiosoma sp. and Chilodonella sp.), 2 monogenean (Gyrodactylus sp. and Dactylogyrus sp.), 2 crustacean (Argulus sp. and Larnaea sp.), 1 digenean (Fellodistomum sp.) and 1 nematoda (Camallanus sp.) parasitic species. These parasites were isolated from body slime, gills and intestine of the infected fishes. Among the isolated parasites Fellodistomum sp. was found as the highest and Chilodonella sp. was found as the lowest in number. Our results indicate that infection and infestation rate of parasites varied with fish size and season and found to be high in the post-monsoon and winter periods (November-March), when fish are most susceptible to parasites. © 2012 Academic Journals Inc. Source

Hussain M.G.,Bangladesh Fisheries Research Institute
Aquatic Ecosystem Health and Management | Year: 2010

Fisheries play an important role in nutrition, income, employment and export earnings in Bangladesh. Fishes contribute to 63% of animal protein intake, about 5% of gross domestic product and 5% of export earnings; approximately 1.4 million people are directly engaged in fishing, 11 million in part-time fishing and another 3 million in aquaculture activities. The fisheries are highly diversified and comprised of inland open water capture fisheries, inland closed water culture fisheries and marine fisheries, which contribute respectively 35%, 44% and 21% to total fish production of 2.1 million tonnes. The major environmental factors having negative impacts on fisheries development are mainly: human impacts on riverine morphology, disruption of ecology, intensive agriculture, and modern developments. Fish conservation acts and regulations exist, but enforcement is difficult because of prevailing socio-economic conditions. Few regulatory mechanisms presently exist for protecting aquaculture environments. Production from inland openwater capture fisheries is declining due to over-exploitation and habitat degradation. However, aquaculture production, which mostly follows traditional practices, has been steadily increasing. Fisheries research has made significant contributions to the large growth of aquaculture through generating a number of economically viable, socially acceptable and environmentally compatible technologies being used by different categories of farmers, large and small. Presently, formulation and implementation of strategies and policies for conservation and sustainable management of degraded aquatic habitats have been immensely effective along with the generation and wider application/dissemination of suitable aquaculture and management technologies, which are expected to ensure the conservation of aquatic genetic resources. This paper reviews all these subjects and emphasizes future needs for development and implementation of policies/regulations at the national level, before it becomes too late to conserve valuable aquatic biodiversity and their habitats. © 2010 AEHMS. Source

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