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An approach to estimate the daily ration of cod during intensive feeding based on 24 hour fishery
(PINRO-IMR Symposium, Conference object, 1992)A model descnbing gashic evacuation developed by dos Santos (1990) using a modified version of the power exponential model for stomach evacuation is applied to the Northeast Arctic cod stomachs collected during 24 hour ... -
A method for estimation of predation mortalities on capelin using a cod-capelin model for the Barents Sea
(PINRO-IMR Symposium, Conference object, 1992)The Barents Sea capelin stock coliapsed during the period 1983-1986. One of the main factors causing the colIapse was a rapid increase in consumption of capelin by cod, caused by the strong 1983 cod year class. Based ... -
Trophic relationships and feeding-dependent growth in the North-East Arctic cod
(PINRO-IMR Symposium, Conference object, 1992) -
Methods and results in the joint PINRO-IMR stomach sampling program
(PINRO-IMR Symposium, Conference object, 1992)In 1984IMR started a stomach samling program om cod (Gadus morhua) in the Barents Sea. The aim of the program was to provide the multispecies model with the quantitative data on the cod's food selection. Later other species ... -
The daily feeding dynamics in various length groups of the Barents Sea capelin
(PINRO-IMR Symposium, Conference object, 1992)A total of 692 capelin stomachs collected in the Goose Bank area in August 1989 by 24 hour fishery were analyzed by 3 cm capelin length groups. The nwnber of prey categories consumed by the Barents Sea capelin showed a ... -
A stochastic model for the Barents Sea capelin stock with predation from an exogenous cod stock
(PINRO-IMR Symposium, Conference object, 1992)Based on the model CAPELIN used with management of the Barents Sea capelin stock until 1986, a model that is structured on age and sex is constructed. The predation on the mature part of the stock is connected to the ... -
Daily rations of cod from the Barents Sea
(PINRO-IMR Symposium, Conference object, 1992)Diurnal feeding rhythms and daily diets of the North-East Arctic cod were investigated based on data obtained at several stations made in the summer of 1988-1989. A well-pronounced feeding rhythmicity was recorded under ... -
Causes of trends and fluctuations in the Arcto-Norwegian stock
(ICES Marine Science Symposia, Conference object, 1994)Published information is used to review trends and fluctuations in landings and stock characteristics/variables (abundance, growth, maturation, distribution, and migrations) in relation to changes in environmental and ... -
Acoustic estimates of 0-group fish abundance in the Barents Sea and adjacent waters in 1992 and 1993
(PINRO-IMR Symposium, Conference object, 1995)Acoustic and biological data collected during the international O-group surveys in 1992 and 1993 were used to estimate the abundance of O-group fish of 4 species; cod, haddock, redfish and polar cod. The abundances of ... -
Comparison of the capture efficiency of 0-group fish in pelagic trawls
(PINRO-IMR Symposium, Conference object, 1995)In 1992 and 1993 experiments were carried out during the international 0-group fish surveys in order to study the capture efficiency of two pelagic trawls. The catches of the standard sampling trawl were compared with ... -
Modelling age-dependent natural mortality of juvenile Norwegian spring-spawning herring (Clupea harengus L.) in the Barents Sea
(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. ... -
Acoustic estimates of abundance-at-age of juvenile Norwegian spring-spawning herring (Clupea harengus L.) in the Barents Sea from 1983 to 1993
(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 ... -
Relations between recruitment indices and occurence in cod stomachs of pre-recruits of cod and haddock in the Barents Sea
(PINRO-IMR Symposium, Conference object, 1995)The predation by North-East Arctic cod on pre-recruits of cod and haddock is reviewed based on data from the joint PINRO-IMR stomach content data base. It is investigated how the abundance indices from surveys of pre-recruits ... -
Relationship between survey indices of recruitment and VPA abundance estimates for North-East Arctic cod
(PINRO-IMR Symposium, Conference object, 1995)Survey estimates of abundance of recruiting and partially recruited age groups are important elements for tuning the VPA of north-east Arctic cod, both for estimating the present state of the stock and for future ... -
Factors determining the year-class strength of Norwegian spring spawning herring
(PINRO-IMR Symposium, Conference object, 1995)More than 30 years of Russian and Norwegian data on spring-spawning herring larvae along the coast of Norway has been investigated and analyzed together with different environmental parameters and spawning stock size. ... -
The dependence of management strategies for Barents Sea cod and capelin on the recruitment models
(PINRO-IMR Symposium, Conference object, 1995)The least studied subject in the assessment and management of Barents Sea cod and capelin is the management strategy. Using a cod-capelin-herring model, the uncertainty in the management strategy of cod and capelin arising ... -
Short note on abundance of SEBASTES Mentella in the 0-group and youngfish surveys as indicator of recruitment overfishing
(PINRO-IMR Symposium, Conference object, 1995)Abundance indices of 0-group Sebastes mentella from the international 0-group survey in the Barents Sea showed a sudden decrease from 1990 to 1991 to a low level which remained for three years. The strength of these weak ... -
The inability of the 0-group saithe survey to forecast the strenght of the year-classes entering the fishery
(PINRO-IMR Symposium, Conference object, 1995)An 0-group saithe trawl survey was conducted annually in the Norwegian Sea and outside the Norwegian coast north of 62"N in April-May 1985-1992. The survey aimed at covering the distribution of 0-group saithe in the open ... -
Trawl designs and techniques used by Norwegian research vessels to sample fish in the pelagic zone
(PINRO-IMR Symposium, Conference object, 1995)In resource surveys, representative identification of species and sizes of fish is of vital importance. Various designs and sizes of pelagic trawls and techniques are used in the pelagic zone by Norwegian research vessels ... -
Predation by juvenile herring (Clupea harengus L.) on Barents Sea capelin (Mallotus villosus Muller) larvae
(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 ...