Abstract
Use of fish toxicants is an important management tool in inland commercial aquaculture. In entrepreneurial fishery in northwest Bangladesh where pond ownership (using rights due to lease) changes frequently (every few years) use of fish toxicants is very routine and more crucial. Along with some traditional fish toxicants (rotenone and aluminium phosphide), unconventional and insecticides like fenpropathrin (not approved for aquaculture use) are being used by fish farm owners in northwest Bangladesh. The study was conducted to understand the consequences of use of fenpropathrin compared to other traditional fish toxicants in commercial aquaculture for harvesting of food fish. Of all the toxicants, fenpropathrin’ s impact was lowest on zooplankton and aquatic insect population, while rotenone had the lowest impact on benthos population in terms of killing and quick recovery time for the population, primarily due to the high turbidity (suspended soil particle) of the pond water (under this study) by which both fenpropathrin and rotenone got affected. Aluminium phosphide found to be more damaging in terms of killing and relatively longer recovery time for zooplankton, aquatic insect and benthos population. Using convenience, quick killing, cheaper price, short duration of toxicity and no potential long-term damage of the waterbody contributes positively for fenpropathrin as fish toxicant except the severe potential public health concern from eating of fish killed by fenpropathrin due to very high bioconcentration factor of fenpropathrin; hence, demands regulation of fenpropathrin’ s use as fish toxicants for food fish.
 Asian Australas. J. Food Saf. Secur. 2019, 3(1), 27-37
Highlights
Commercial pond aquaculture has its unrelenting pressure of economic necessity to produce fish in most efficiently but inexpensively as possible (Lennon et al, 1970)
Materials and Methods For this study 3 different farmers were identified in Parila union of Poba upazilla of Rajshahi district who intended to use different fish toxicants namely fenpropathrin (Danitol), rotenone and aluminium phosphide in commercial aquaculture ponds
Based on the calculation, rotenone, aluminium phosphide and fenpropathrin were found to be used at 0.272 mg/liter, 0.61 mg/liter and 0.065mg/liter respectively
Summary
Commercial pond aquaculture has its unrelenting pressure of economic necessity to produce fish in most efficiently but inexpensively as possible (Lennon et al, 1970). A natural toxicant derived from leguminous plants mainly found in southeast Asia, Latin America and east Africa (Finlayson et al, 2000) is highly toxic to fish and aquatic life but significantly less toxic to birds and mammals made it favorable as piscicide, used historically as most environmentally benign pesticide (Ling, 2003). Most of the fish species exhibit higher sensitivity to rotenone than most of the aquatic invertebrates (Durkin, 2008). Apart from rotenone’s using difficulty, to ensure killing of fish species that are relatively hardy (catfish, Channa sp., Tilapia sp., Anabus sp etc.) may require use of unusually high amount of rotenone, which increases the cost significantly
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