© 2001 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
Modelling infection of Baltic herring (Clupea harengus membras) by larval Anisakis simplex
Sea Fisheries Institute ul. Ko
ataja 1, 81332, Gdynia, Poland
Correspondence to: Jan Horbowy; e-mail: horbowy{at}mir.gdynia.pl
Anisakis simplex larvae were counted in the body cavities of Baltic herring collected in the southern Baltic in 19921993, 19951996 and 1997. Mean infection intensity in infected fish was generally <10 in fish <30 cm in length but increased sharply to 2050 in larger fish. Intensities recorded in 1997 were 3040% higher than those documented in 19921993 and 19951996.
Models relating infection intensity to fish length and weight were developed and used to estimate the asymptotic size of herring. The L
estimates ranged from 32.834.0 cm, and the W
varied from 335.4 to 356.0 g. Estimates of asymptotic length and weight from models of infection intensity were more stable and generally were more precise than those determined from length and weight-at-age data.
Keywords: herring, Anisakis simplex, Baltic, model, asymptotic size
Received 29 November 1999; accepted 26 October 2000.