Changes in the quality of Catla (Catla catla) stored immediately (0 h) in ice, after six (6) hours in ice and at ambient temperature soon after catch was investigated. The samples were examined by sensory (organoleptic and rigor mortis progress) and biochemical parameters (total volatile base nitrogen, trimethylamine nitrogen and pH). The rigor mortis proceeded faster in fish stored at ambient temperature (28°C-30°C) than those stored in ice (0°C). The duration of full rigor stage and total rigor period were 8h and 13h for fish stored in ambient temperature and 77h and 127h for fish stored in ice (both immediate and delayed icing) respectively. Organoleptically, the acceptability of fish varied between 16-20 days in both the iced storage conditions and 12-13.5h at ambient temperature. The fishes were organoleptically just acceptable on the 16th day of storage and just unacceptable on the 20th day. The values of total volatile base nitrogen (TVB-N), trimethylamine nitrogen (TMA-N) and pH were 18.9 mg% (0h), 16.74 mg% (6 h), 5.40 mg% (0h), 4.86 mg% (6h) and 6.93 (0h), 6.65 (6h) respectively at the time of rejection for fish stored in ice. Those values for fish stored at ambient temperature were 28.44 mg%, 6.22 mg% and 7.18 respectively at the time of rejection.
Length-Weight relationship in adult (one year old) Heteropneustes fossilis collected from culture pond of Batiaghata in Khulna of Bangladesh was conducted during 1 June, 2007 to 2 July, 2007. The overall sex ratio of male to female was 1: 0.98. The total length was recorded in cm and the weight of the individuals was measured by means of a sensitive (3 decimal places) electric balance in g. The relationship indicated that weight of fish is directly related with the length of the species. A significant length-weight relationship was found for combined sex (R2 = 0.943), male (R2 = 0.789) and female (R2 = 0.939) in respect to total length of the species. This indicated that they are positively correlated. The peak condition factor (K) value was found at (5.09±0.526), (6.138±.0.60) and (5.77±0.40) in 17-18.9cm, 11.5-12.4cm and 15.5-16.9 cm and relative condition factor (Kn) value was found at (1.09±0.129), (1.186±0.17) and (1.148±0.09) in 17-18.9 cm, 16.5-17.4 cm and 15.5-16.9 cm of total length class size for combined sex, male and female respectively. Regression coefficient values (b) were found at 2.13 and 4.97 for male and female respectively, these values were not significantly different from 3 (Isometric growth) (p>0.05) and mean b value was found at 3.5 which indicated that the growth of adult was positive allometric. To ensure the continuity of the biodiversity and to retain the species for future generation, proper management and culture techniques of these species should be encouraged
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