Blar i Symposium proceedings på forfatter "Toresen, Reidar"
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Acoustic estimates of abundance-at-age of juvenile Norwegian spring-spawning herring (Clupea harengus L.) in the Barents Sea from 1983 to 1993
Toresen, Reidar; Barros, P. de (PINRO-IMR Symposium, Conference object, 1995)The first year-class of Norwegian spring-spawning herring to enter the Barents Sea in significant numbers since the stock collapse in the late 1960'ies was the 1983-cohort. Regular acoustic surveys have been carried out ... -
Long term changes of growth and maturation in the Norwegian spring spawning herring
Toresen, Reidar (PINRO-IMR Symposium, Conference object, 1990)Two periods with great differences i n year class abundance and recruitment where chosen for growth and maturation studies, 1950 - 1960 and 1973 - 1983. In the first period, the mean year class strength at 3 years was ... -
Modelling age-dependent natural mortality of juvenile Norwegian spring-spawning herring (Clupea harengus L.) in the Barents Sea
Barros, P. de; Toresen, Reidar (PINRO-IMR Symposium, Conference object, 1995)Understanding the patterns of mortality in the juvenile stages is essential for improving current stock assessment procedures. A crucial aspect is at which stage in the life cycle of fish is year-class strength determined. ... -
Predation by juvenile herring (Clupea harengus L.) on Barents Sea capelin (Mallotus villosus Muller) larvae
Huse, Geir; Toresen, Reidar (PINRO-IMR Symposium, Conference object, 1995)In years with high abundance of juvenile Norwegian spring spawning herring in the Barents sea, the year-class strength of capelin has frequently been observed to be poor. It has therefore been suggested that predation ... -
Survival tests of internally tagged herring
Hamre, Johannes; Toresen, Reidar (PINRO-IMR Symposium, Conference object, 1990)Two separate survival tests were run in an indoor basin. Herring was tagged applying internal metal tags as used in the annua1 tagging experiments on the Norwegian spring-spawners. The mortality caused by tagging was ...