DISEASES AND INJURIES ASSOCIATED WITH MORTALITY OF HATCHERY-REARED BALTIC COD (GADUS-MORHUA L) LARVAE

A cod hatching plant was established in 1992 on the island of Bornholm in the Baltic Sea in order to elucidate the possibilites for restocki ng of cod fry in this brackishwater system. The disease prevalence in 3 batches of hatchery-reared yolksac larvae from the Baltic cod (Gadus morhua L.) was monitored during the posthatch period. High prevalence s of bacteriosis/mycosis, lordosis/scoliosis, injuries and protozoan e ndoparasitism were recorded. Vibrio sp. and Vibrio anguillarum serovar 04, 06, 08 in addition to nontypable strains and saprolegniaceous fun gi were isolated from the larvae. The dinoflagellate-like endoparasite s were located in the yolksac of the cod larvae.