Publication Date:
2021-07-15
Description:
This study was conducted to determine the effects of dichlorvos ~9 2, 2 - dichlorovinyl dimethyl phosphate (DDVP)~0 on the growth of Clarias gariepinus fingerlings. The experiment was conducted in two phases: the first phase involved the exposure of the fish to different concentrations ~9 0.00 (control), 0.4ppm, 0.5ppm, 0.6ppm, 0.7ppm, 0.8ppm, 0.9ppm, 1.0ppm, 1.1 ppm and 1.2ppm~0 of dichlorvos for four days. The second phase was a recovery process in which the fish that survived from the first phase were introduced into clean, dechlorinated, toxicant-free water and were fed at 3% of their body weight for 12 weeks. The change in weight was measured every fortnight and the feed fed was adjusted to accommodate the change in weight. The highest values for weight gain, percentage weight gain, specific growth rate and average daily weight gain occurred in the control and these values were significantly (p〈0.05) higher than the values of these parameters recorded in the other treatments. The range of values of weight gain, percentage weight gain, specific growth rate and average daily weight gain are 6.76 ~c 3.01-18.45 ~c 8.90g, 69.45 ~c 18.52 - 105.52 ~c 33.67%, 1.54 ~c 0.33 - 2.08 ~c 0.46%/day and 0.48 ~c 0.21 - 1.21 ~c 0.65g respectively. Based on the results of this study, the exposure of fingerlings of Clarias gariepinus to dichlorvos ~9 2, 2- dichlorovinyl dimethyl phosphate (DDVP)~0 affected the growth of the fish. Therefore, the use of dichlorvos on stored grains should be regulated because uncontrolled usage could cause mortality and impairment of growth in fish if the pesticide gets washed into water bodies inhabited by fish.
Description:
Includes: 1 table.;Also includes: 9 references.
Keywords:
Aquaculture
;
Ecology
;
Pollution
;
Clarias gariepinus
;
Nigeria
;
Lagos State
;
Toxicity
;
Pesticide
;
Clarias gariepinus
;
Growth performance
;
freshwater environment
;
Freshwater fish
;
Fingerlings
;
Toxicants
;
Pesticides
;
Toxicity
;
Bioaccumulation
;
Feeding
;
Growth rate
;
Pollution effects
Repository Name:
AquaDocs
Type:
conference_item
,
TRUE
Format:
application/pdf
Format:
application/pdf
Format:
57-59
