The paper deals with the variations in the toxicity of 2,4-D to Cyprinus carpio at different temperatures during different seasons of the year. The higher temperature has higher toxicity and vice versa at the same concentration. The TLm values indicate that there is a 7-7.5 fold increase in toxicity with the rise in temperature from 17OC in February (winter) to 39OC in May (summer). These results have significance in manipulating the 2,4-D doses for the eradication of aquatic weeds in different seasons.
The results of static and acute bioassay studies on Daphnia [umholtzi (C\adoccra) and Cypris subglobosa (Ostracoda) to the varying dosages of Cu, Cd and Zn were presented. The 96 h, LC so values for Daphnia were found to be 0-009, 0-083, 0-437 and for Cypris 0-25, 0'687,8'3 mgl-I for Cu, Cd and Zn respectively. This indicates that Daphnia is very sensitive while Cypris has a good amount of resistance. The rank order for toxicity of 3 metals is eu> Cd> Zn. The study indicates that the waters getting polluted by heavy metals even at low concentration would remove the population of fish-food organisms without directly effecting fish fauna, thus making water body unfit for fishery use.
Fresh tengra fish (Mystus tengara) samples were collected from fish market, Kawardha and different levels of salt and turmeric powder were added (0% salt and 0% turmeric powder, T0; 2% salt with 0.2% turmeric, T1; 4% salt with 0.2% turmeric, T2; 8% salt with 0% turmeric powder, T3 and 12% salt with 0% turmeric powder, T4). The processed and salted fish were dried in hot air oven at 60°C for 20 hours. Carcass yield (%), salt content (%), pH and moisture content of cured fish were respectively 39.06 - 43.87%, 3.15 - 4.59%, 6.52- 6.90 and 4.91 – 6.84 %. The sensory assessment showed that treatment T2 had the highest score for texture 5.70; appearance 8.30, odor 8.02 and taste 8.05 while T0 and T1 had least sensory scores. Aerobic plate count of various treatments were found significantly different (p Lass Than 0.05) with the lowest in treatment T4 (3.3 x 103 cfu/g) followed by treatment T2 (3.7 x 103 cfu/g) and highest in treatment T0 (5.4 x 103 cfu/g). Tengra fish cured with 4% salt and 0.2% turmeric powder (T2) found to be the best in yield, microbial load and sensory attributes. The dry salted fish processed with low level of salt and turmeric powder are best for human consumption, particularly for the patients of blood pressure and diabetes.Therefore, preparation of dried products from low-cost fish will help in increasing the employment opportunities and also reduce post-harvest losses.
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