Sampling plans for pre-packed fish and fish products

An outline is given of a sampling plan for prepacked fish products based on the net weight of the container, which may be used to make the inspection of fish and fish products easier and more effective.

Rate of filtration by Perna viridis pre-exposed to heavy metals

Perna viridis exposed to different concentrations of copper and zinc for varying periods and then the rate of filtration estimated under metal free culture conditions. The concentrations under which the animals were maintained before the experiments were 0.025 to 0.150 p.p.m. of zinc and 0.005 to 0.08 p.p.m. of copper.

Effect of pre-processing iced storage on deteriorative changes in lipids of silver pomfrets stored at -18°C

Silver pomfret (Pampus argenteus) was frozen in the fresh condition as well as after holding in ice for one, two and four days. Evaluation of changes in the quality of these samples during storage at -18°C has shown that shelf-life decreased sharply if the pre-freezing iced storage was more than one day. The shelf-life of one day iced, two day iced and four day iced frozen samples were 32, 20 and 16 weeks respectively. No correlation was observed between the peroxide value and the organoleptic detection of rancid flavour. Levels of free fatty acids were more in the samples frozen after storage in ice for one day than in all the other samples.

Some observations on the growth and cyst production characteristics of the brine shrimp Artemia sp. (Gujarat strain) in pond culture and its potential for import substitution

Experimental culture of the brine shrimp Artemia sp. (Gujarat strain) and production of cyst is discussed. The qualitative and quantitative aspects of the cyst and its economic potential for import substitution are highlighted.

Temperature effects on pathogenicity of selected Edwardsiella tarda strain to Japanese eel, Anguilla japonica

Temperature effect on the pathogenicity of selected Edwardsiella tarda V-1 strain to Japanese eel, Anguilla japonica was investigated. To evaluate the effects of both pathogen incubation temperature and fish cultivation temperature on pathogen pathogenicity a two-factor design was conducted. E. tarda was incubated at 15, 20, 25, 30 and 37±1°C, and the fish (mean weight: 100g) were reared at 15, 20, 25 and 28±1°C respectively. The fish reared at different temperatures were infected with the E. tarda incubated at different temperatures. The results of a 4-day LD50 test showed that temperature significantly affected the pathogenicity of E. tarda (p<0.01) and the interaction between the two factors was also significant (p<0.01). For fish reared at 20°C the pathogenicity of E. tarda was the highest at 30°C of pathogen incubation. When the fish rearing temperature was raised to 25 and 28°C, the pathogenicity of E. tarda incubated at all temperatures increased. Isolation testing demonstrated results similar to those of LD50. The selected isolate was virulent to eel, but pathogenicity varied with temperature.