RESUMO
To evaluate the efficiency of different probionts (Lacto bacillus and yeast) on clown fish, Amphiprion sebae three different pelleted diets were formulated with 30% protein. Two diets were supplemented with probionts such as 2% Lacto bacillus and 2% yeast without probiont was used as control. The water stability of these diets was studied and the leaching percentage during 6 hrs period was 17.15 to 18.25%. The specific growth rate of control diet fed fish has the lowest value of 3.65 to 4% in probionts supplemented diets fed fishes. The gross production efficiency was also higher in probionts supplemented diet fed groups than control group.
RESUMO
Theprevalence and seasonal variation of bacterial indicators of faecal pollution such as total coliform bacteria, faecal coliform bacteria, Escherichia coli and faecal streptococci were investigated in samples of water and beach sand from the four fish landing centres of Thoothukudi. Further the samples were screened for Salmonella to study the reliability of faecal indicator bacteria as an index of human pathogenic bacteria. Total coliform bacteria, faecal coliform bacteria and Escherichia coli were isolated from all four landing centres from undetectable to the maximum detectable level of over Most Probable Number 140 throughout the year with no obvious seasonal variation. Faecal streptococci were also detected in most samples. There was no discernable relationship between faecal indicators and physical parameters. The relationship between faecal indicators and Salmonella was not significant (p > 0.05). The results showed that the coastal waters along Thoothukudi is polluted and presents a potential risk to public for recreational and fishing activities.