Protein, carbohydrate, fat, ash and moisture contents in the body muscle of Anabas testudineus (Bloch) were investigated. The compositions varied seasonally in relation to reproductive cycle of the fish. Significant correlation existed between moisture and carbohydrate, moisture and fat, moisture and protein, moisture and ash, protein and ash, fat and carbohydrate, fat and ash, protein and carbohydrate. The protein content found to be higher in medium sized fishes and gradually decreased with the increase of age. Fat content was higher in large-sized male than that of the females. Carbohydrate content was slightly higher in male than the female.
Bangladesh J. Sci. Ind. Res. 41(3-4), 219-226, 2006
The different parameters on physico-chemical characteristics especially the free fatty acid (FFA), peroxide values, iodine values, lipid class composition and major elements of shrimp head waste were studied. The oil was fractionated into mono, di and triglycerides by silicic acid column chromatography. The calcium ranged from 3.26mg/100 gm to 5.08 mg/100 gm, magnesium 4.79mg/100gm to 7.02 mg/100gm, sodium 51.09 mg/100gm to 73.05 mg/100gm and potassium 52.91 mg/100gm to 83.07 mg/100gm respectively. The percentage of crude protein is 49.47.
Bangladesh J. Sci. Ind. Res. 41(1-2), 63-66, 2006
Fluctuations of important physico-chemical parameters of a pond were investigated. Different pairs of variables had different relationships with each other by the relevant coefficients of correlation. The pH value was 7.0-7.8 and inversely related to dissolved oxygen. It is highly significant with free CO 2 and CO 3 . Dissolved oxygen content is highly significant with water temperature, inverse relationship with free CO 2 , CO 3 but no relationship with HCO 3 . The carbonate content was 9.8-12.5 ppm. The results showed significant influence of major components on the productivity of fishes in a pond.
Soybean (Glycine max L., Variety PB-1) is an important oilseed crop though not extensively cultivated in Bangladesh. Five different plant extracts i.e., Bara Bishkatali leaf extract, sesame seed oil, castor seed oil, a mixture of sesame oil and neem seed oil and tobacco leaf extract were sprayed prior to pest infestation. The major insect pests encountered were the leaf roller (Sylepta derogata), pentatomid bug (Nezara viridula and Piezodorus hybneri), noctuid semilooper (Trichoplusia ni) and blue butterfly (Euchrysops cnejas). Among the applied treatments, tobacco leaf extract showed the best result followed by Bara Bishkatali leaf extract, sesame seed oil and a mixture of sesame oil and neem seed oil and castor oil. Some unidentified beneficial eurytomid, braconid, ichneumonid and encyrtid insect parasites and coccinellid predators played an important role in suppressing the pest population during the study period. The maximum yield was 36.7 maunds per acre in the BCSIR Laboratories Campus, Rajshahi but the yield was only 3 maunds per acre in the Oilseeds Cultivation Centre Patgram, Lalmonirhat.
Bangladesh J. Sci. Ind. Res. 41(1-2), 73-76, 2006
The effects of interspecific competition between parasitoids Anisopteromalus calandrae (Howard) and Dinarmus basalis (Rond.) for their host, Callosobruchus chinensis (L.) have been conducted at a constant temperature of 30±1°C and 75±5% r.h. A number of 40, 80, 120, 160 and 200 4 th instar larval host containing seeds of C. chinensis were confined to 24,48,72,96 and 120 hours egg laying of both the parasitoids respectively. Total number of progeny produced by the two parasitoids were 16.9 ± 2.76, 20.7 ± 5.69, 31.1± 7.47, 38.6 ± 5.87 and 56.7 ± 9.86 at 24, 48, 72, 96 and 120 hours duration respectively. The parasitoid, D. basalis showed higher parasitism than A. calandrae in competition of host choice in all the egg laying periods observed.
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