Acoustic estimates of spawning cod in the Lofoten area in 1982 and 1983
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Date
1984Metadata
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- Symposium proceedings [168]
Abstract
The main spawning grounds for Arctic cod, the Lofoten area,
were covered by acoustic surveys 7 times in 1983 and 12 times
in 1983 during the prespawning and spawning season. The results
indicated a spawning stock in the area of approximately 80
million specimens in 1982. and 50 million spec-imens in 1983.
These figures were less than half the estimated total spawning
stock of Arctic cod these years. The acoustic data were analyzed
in order to estimate the migration rate in and out of the
Lofoten area during the surveying period. The results indicate
that in 1983 spent cod started to leave the grounds in the
middle of March, and that the fish flux in and out of the area
is an important factor to be considered when evaluating the
acoustic survey results. In general acoustic surveys will tend
to underestimate the number of spawners Bn the area under such
circumstances.
Description
The proceedings of the Soviet-Norwegian symposium on: Reproduction and recruitment of Arctic cod. Leningrad 26 - 30 September 1983.
Series
PINRO-IMR Symposium1