Muligheter og prioriteringer for flerbestandsforvaltning i norske fiskerier

Denne rapporten svarer opp en henvendelse fra Stortinget som har bedt regjeringen utarbeide en opptrappingsplan for norsk bestands- og ressursforskning med mål om å utvikle og innføre en modell for flerbestandsforvaltning av fiskeriene. Flerbestandsforvaltning er et sentralt begrep innen økosystembasert forvaltning, der hensyn til økologiske prosesser er integrert slik at forvaltning av en bestand ses i sammenheng med andre bestander i økosystemet. Utvalget anbefaler ingen generell overgang til flerbestandsforvaltning. Det som trengs etter vårt syn er individuelle vurderinger av de forskjellige bestandene i forhold til om der er sterke trofiske interaksjoner, forskningsmessig basis og enighet blant interessenter. Nedenfor har vi listet opp hvilke bestander og forskningsoppgaver vi mener bør prioriteres for å styrke kunnskapsgrunnlaget for flerbestandsforvaltningpublishedVersio

Lumpsucker (Cyclopterus lumpus) otoliths: dissection, mounting and age-reading

A workshop was held at Institute of Marine Research, Flødevigen Marine Research Station, Arendal, Norway, 17-19 February 1999, to investigate methodes for age-determination of lumpsucker (Cyclopterus lumpus) from otoliths. The report summarises the results from the workshop and some subsequent analyses. The otoliths are very small and special training is necessary to locate them. The zonation pattern is relatively distinct and it was usually easy to establish a set of rings assumed to be annuli. The precision of age estimates increased as a result of training and discussions in the group, but was hampered by the lack of verifications available at the time of reading. After the workshop, the resulting age-length relationship was compared to new estimates of length-composition of juvenile lumpsucker prior to and after the migration from the coast. This represents the first documented attempt to verify annuli in otoliths of lumpsucker from Norwegian waters. It is recommended that a new workshop should be arranged to put together more verified age data and to see if a reasonable precision is achievable when the age readings are based on verified patterns.Lumpsucker (Cyclopterus lumpus) otoliths: dissection, mounting and age-readingpublishedVersio

Lumpsucker (Cyclopterus lumpus) otoliths: dissection, mounting and age-reading

Source at https://nofima.no/filearchive/Rapport%2009-2000.pdf.A workshop was held at Institute of Marine Research, Flødevigen Marine Research Station, Arendal, Norway, 17-19 February 1999, to investigate methodes for age-determination of lumpsucker (Cyclopterus lumpus) from otoliths. The report summarises the results from the workshop and some subsequent analyses. The otoliths are very small and special training is necessary to locate them. The zonation pattern is relatively distinct and it was usually easy to establish a set of rings assumed to be annuli. The precision of age estimates increased as a result of training and discussions in the group, but was hampered by the lack of verifications available at the time of reading. After the workshop, the resulting age-length relationship was compared to new estimates of length-composition of juvenile lumpsucker prior to and after the migration from the coast. This represents the first documented attempt to verify annuli in otoliths of lumpsucker from Norwegian waters. It is recommended that a new workshop should be arranged to put together more verified age data and to see if a reasonable precision is achievable when the age readings are based on verified patterns

Lumpsucker (Cyclopterus lumpus) otoliths: dissection, mounting and age-reading

A workshop was held at Institute of Marine Research, Flødevigen Marine Research Station, Arendal, Norway, 17-19 February 1999, to investigate methodes for age-determination of lumpsucker (Cyclopterus lumpus) from otoliths. The report summarises the results from the workshop and some subsequent analyses. The otoliths are very small and special training is necessary to locate them. The zonation pattern is relatively distinct and it was usually easy to establish a set of rings assumed to be annuli. The precision of age estimates increased as a result of training and discussions in the group, but was hampered by the lack of verifications available at the time of reading. After the workshop, the resulting age-length relationship was compared to new estimates of length-composition of juvenile lumpsucker prior to and after the migration from the coast. This represents the first documented attempt to verify annuli in otoliths of lumpsucker from Norwegian waters. It is recommended that a new workshop should be arranged to put together more verified age data and to see if a reasonable precision is achievable when the age readings are based on verified patterns.Lumpsucker (Cyclopterus lumpus) otoliths: dissection, mounting and age-readingpublishedVersio

Lumpsucker (Cyclopterus lumpus) otoliths: dissection, mounting and age-reading

A workshop was held at Institute of Marine Research, Flødevigen Marine Research Station, Arendal, Norway, 17-19 February 1999, to investigate methodes for age-determination of lumpsucker (Cyclopterus lumpus) from otoliths. The report summarises the results from the workshop and some subsequent analyses. The otoliths are very small and special training is necessary to locate them. The zonation pattern is relatively distinct and it was usually easy to establish a set of rings assumed to be annuli. The precision of age estimates increased as a result of training and discussions in the group, but was hampered by the lack of verifications available at the time of reading. After the workshop, the resulting age-length relationship was compared to new estimates of length-composition of juvenile lumpsucker prior to and after the migration from the coast. This represents the first documented attempt to verify annuli in otoliths of lumpsucker from Norwegian waters. It is recommended that a new workshop should be arranged to put together more verified age data and to see if a reasonable precision is achievable when the age readings are based on verified patterns

Lumpsucker (Cyclopterus lumpus) otoliths: dissection, mounting and age-reading

A workshop was held at Institute of Marine Research, Flødevigen Marine Research Station, Arendal, Norway, 17-19 February 1999, to investigate methodes for age-determination of lumpsucker (Cyclopterus lumpus) from otoliths. The report summarises the results from the workshop and some subsequent analyses. The otoliths are very small and special training is necessary to locate them. The zonation pattern is relatively distinct and it was usually easy to establish a set of rings assumed to be annuli. The precision of age estimates increased as a result of training and discussions in the group, but was hampered by the lack of verifications available at the time of reading. After the workshop, the resulting age-length relationship was compared to new estimates of length-composition of juvenile lumpsucker prior to and after the migration from the coast. This represents the first documented attempt to verify annuli in otoliths of lumpsucker from Norwegian waters. It is recommended that a new workshop should be arranged to put together more verified age data and to see if a reasonable precision is achievable when the age readings are based on verified patterns

Lumpsucker (Cyclopterus lumpus) otoliths: dissection, mounting and age-reading

A workshop was held at Institute of Marine Research, Flødevigen Marine Research Station, Arendal, Norway, 17-19 February 1999, to investigate methodes for age-determination of lumpsucker (Cyclopterus lumpus) from otoliths. The report summarises the results from the workshop and some subsequent analyses. The otoliths are very small and special training is necessary to locate them. The zonation pattern is relatively distinct and it was usually easy to establish a set of rings assumed to be annuli. The precision of age estimates increased as a result of training and discussions in the group, but was hampered by the lack of verifications available at the time of reading. After the workshop, the resulting age-length relationship was compared to new estimates of length-composition of juvenile lumpsucker prior to and after the migration from the coast. This represents the first documented attempt to verify annuli in otoliths of lumpsucker from Norwegian waters. It is recommended that a new workshop should be arranged to put together more verified age data and to see if a reasonable precision is achievable when the age readings are based on verified patterns.Lumpsucker (Cyclopterus lumpus) otoliths: dissection, mounting and age-readingpublishedVersio