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Potential sources of unaccounted mortality in the fishery for Norwegian spring spawning herring
(ICES CM documents, Working paper, 2002)The stock of Norwegian spring spawning herring (NSSH) is managed and fished by 5 different parties. These are the EU, Faroe Islands, Iceland, Norway and Russia. The most common gears are purse seine and pelagic trawl. The ... -
Power budget equations and calibration factors for fish abundance estimation using scientific echo sounders and sonar systems
(Journal article; Peer reviewed, 2016-07-09)Acoustic methods used in fish abundance estimation constitute a key part of the analytic assessment that makes the basis for abundance estimation of marine resources. The methods rely on power-budget equations and calibrated ... -
Power-budget and echo-integrator equations for fish abundance estimation
(Fisken og Havet;10-2013, Research report, 2013-12-31)For abundance estimation and species identification on fisheries acoustic surveys, control with temperature and finite amplitude effects in the sea demands the calibration factor C of the conventional echo-integrator ... -
Pre-catch and discard mortality in Northeast Atlantic herring and mackerel fisheries: consequences for stock estimates and advice
(Peer reviewed; Journal article, 2021)Unaccounted mortality caused by discarding or pre-catch losses is a major challenge for fisheries management. In pelagic fisheries, a considerable proportion of catches may be lost due to intentional release of unwanted ... -
Pre-fertilization gamete thermal environment influences reproductive success, unmasking opposing sex-specific responses in Atlantic salmon (Salmo salar)
(Peer reviewed; Journal article, 2023)The environment gametes perform in just before fertilization is increasingly recognized to affect offspring fitness, yet the contributions of male and female gametes and their adaptive significance remain largely unexplored. ... -
Pre-recruit studies of the North-East Arctic Greenland halibut stock
(PINRO-IMR Symposium, Conference object, 1995)Abundance indices of 0-group Greenland halibut (Reinhardtius hippoglossoides) from the international 0-group surveys in the Barents Sea showed a sudden decrease from 1987 to 1988 to a low level which has remained for the ... -
Precision in recruitment estimates and its implications on management of demersal fish stocks
(PINRO-IMR Symposium, Conference object, 1995)Errors in abundance indices of recruiting year-classes will affect stock predictions. The contribution of recruiting year-classes to the predictions of catch and spawning stock biomass for the stocks of Northeast Arctic ... -
Predation by Benguela hake (Merluccius polli) on commercially exploited shrimps (Parapenaeus longirostris and Aristeus varidens) in Angolan waters.
(ICES CM documents, Working paper, 1997) -
Predation by copepods upon natural populations of Phaeocystis pouchetii as a function of the physiological state of the prey
(Journal article; Peer reviewed, 1990-11-01)Conflicting data have been previously presented on the ability of copepods to prey upon the prymneslophyte Phaeocystis pouchetii. While some have suggested that gelatinous colonies of this species contain biochemical ... -
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 ... -
Predation mortality from ambush and cruising predators on newly-settled 0-group gadoids
(Peer reviewed; Journal article, 2020)We investigated predation from an ambush predator (shorthorn sculpin) and two cruising predators (Atlantic cod and saithe) on bottom-settled 0-group cod and saithe juveniles in a fjord in northern Norway. Stomach contents ... -
Predation of Atlantic salmon across ontogenetic stages and impacts on populations
(Peer reviewed; Journal article, 2023)Managers and stakeholders increasingly ask whether predation is a driving force behind the poor status of many species, and whether predator control is likely to be a successful management action to intervene. We review ... -
Predation of Atlantic salmon across ontogenetic stages and impacts on populations
(Peer reviewed; Journal article, 2023)Managers and stakeholders increasingly ask whether predation is a driving force behind the poor status of many species, and whether predator control is likely to be a successful management action to intervene. We review ... -
Predation of oyster larvae by Aurelia aurita in a Norwegian oyster pond
(ICES CM Documents;1986/F:21, Working paper, 1986)In the norwegian oyster spatting ponds several factors may influence the spat production. During a basic, general study in a pond in 1983-84, Aurelia aurita was demonstrated to be a heavy predator on pelagic oyster ... -
Predation on early life stages is decisive for year-class strength in the Barents Sea capelin (Mallotus villosus) stock
(Journal article; Peer reviewed, 2015-10-11)Year-class strength of Barents Sea capelin has been monitored closely since the early 1970s and during this ∼45 years period three short periods of almost total recruitment failure leading to three stock collapses have ... -
Predation on fish larvae as a regulatory force illustrated in enclosure experiments with large groups of larvae
(ICES CM Documents;1983/L:39, Working paper, 1983) -
Predation on hatchery-reared lobsters released in the wild
(Journal article; Peer reviewed, 2000)Predation on hatchery-reared lobsters (Homarus gammarus) in the wild was studied in order to identify predators in southwestern Norway on rocky and sandy substrates in winter and summer. Lobsters of 12–15 mm carapace length ... -
Predation on herring (Clupea harengus) eggs and young larvae.
(ICES CM Documents;1980/H:33, Working paper, 1980)The study presented here is part of a greater project dealing with recruitment studies of a local herring stock in Lindåspollene north of Bergen. Fish predators on herring spawn, mainly cod and haddock, were trapped ... -
Predation on the eggs of Norwegian spring-spawning herring at a spawning ground outside the westcoast of Norway in 1981
(ICES CM Documents;1985/H:55, Working paper, 1985)Predation on the eggs of demersal spawners has been reported several times, and findings of haddock feeding on capelin or herring eggs is a well known phenomenon. A spawning ground where spawning has been detected through ...