Lethal and sublethal toxicity of monocrotophos an organophosphate on the juveniles of rohu labeo rohita (ham.) under tropical conditions
| dc.contributor.advisor | Anna Mercy, T V | |
| dc.contributor.author | Ramani, M B | |
| dc.contributor.author | KAU | |
| dc.date.accessioned | 2017-11-27T10:17:44Z | |
| dc.date.available | 2017-11-27T10:17:44Z | |
| dc.date.issued | 2000 | |
| dc.description.abstract | The seasonal utilization of paddy field for fish culture is quite common in Kerala and West Bengal. In recent years, with the advent of high yielding varieties of paddy, the use of pesticide has become widely prevalent. Monocrotophos is one of the commonly used organophosphate pesticides in the paddy fields of Kerala. The present study was designed to arrive at an experimentally determined application factor for fixing tentative water quality criteria for monocrotophos under tropical conditions. Juvenile Rohu Labeo rohita (46.82 ± 0.S2 mm total length, 1012.29 ± 43.12 mg wet weight) were subjected to static lethal and sublethal bioassay. The 48 h LCso value was found to .be 104.02 mg/I at 28 ± 2°C. Juvenile Rohu were exposed to sublethal monocrotophos concentrations (2, S, 1 a, 1S, 20 and 30 mg/l) for 32 days at 28 ± 2°C without aeration. Treatment media were replaced every 24 hr. Fish were fed a pelleted diet at 6% wet body weight per day. Rohu exposed to S, 1 a, 1S, 20 and 30 mg/l monocrotophos showed significantly lower mean wet weight gain, specific growth rate (SGR) and food conversion efficiency (FCE). But fishes of lower monocrotophos concentration of 2.0 mg/I were not significantly different from the control. Juveniles exposed to 2, S, 1 a, 1S, 20 and 30 mg/I monocrotophos concentrations had higher moisture and ash content, and lower protein, lipid and carbohydrate contents, as body nutrients were depleted. The maximum acceptable toxicant concentration for juvenile Rohu was 3.16 mg/l for S~R and FeE as end points (the most sensitive) and 24.S mg/l for percentage survival as an end point (the least sensitive) indicating application factors of 0.03 and 0.24 respectively. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810036520 | |
| dc.keywords | Fishery Biology | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Department of Fishery Biology, College of Fisheries,Panangad | en_US |
| dc.sub | Fisheries | en_US |
| dc.subject | null | en_US |
| dc.theme | Lethal and sublethal toxicity of monocrotophos | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Lethal and sublethal toxicity of monocrotophos an organophosphate on the juveniles of rohu labeo rohita (ham.) under tropical conditions | en_US |
| dc.type | Thesis | en_US |