Surveillance of bacterial susceptibility to five antimicrobial agents was performed during a 1-year period in and around four freshwater fish farms situated along a stream in western Denmark. Besides assessing the levels of antibiotic resistance among the culturable fraction of microorganisms in fish, water, and sediment samples, two major fish pathogens (88 Flavobacterium psychrophilum isolates and 134 Yersinia ruckeri isolates) and 313 motile Aeromonas isolates, representing a group of ubiquitous aquatic bacteria, were isolated from the same samples.

The results of a study on the fishery, biology, exploitation and mortality of hilsa shad (Hisa ilishu) are presented. The average annual landing of Hilsa ilisha for 1979 - 88 was 5710 tonnes forming 0.4% of the total landings. The major craft and gears and the contributions of different states are presented. Age at first maturity was estimated as 1.98 years. The details of spawning migrations, maturity stages and fecundity are discussed. The total mortality, natural mortality and fishing mortality coefficients were obtained as 1.71,0.704 and 0.9444 respectively.