.

Clyde herring

Main characteristics and peculiarities
• 2 stock components: a resident spring spawning and an immigrant autumn spawning component. The spring spawning component supported a strong and locally important fishery from 1955-1974 at catch levels ranging from 4'000 to 15'000 t. since 1988 catches have been below the TAC.
• fishery traditionally in Oct/Nov
• no fishery independent surveys, no stock component separation, state of the stock unknown

Assessment Summary
year	2000 (WG 2001)
type	no assessment
assessment quality	-
main problems	(1) no fishery independent surveys, no stock component separation (2) establishing a survey would be too costly compared to the value of the fishery
fisheries independent information	none
catch	1 t (1999: 256 t)
spawning stock biomass	SSB unknown
fishing mortality	F unknown
reference points	not defined
state of the stock	uncertain
perspective	uncertain

Stock parameters (under construction)

Distribution
Clyde herring is distributed in the Clyde (belonging to ICES Area VIa, west of Scotland).

Management advice
Existing time and area restrictions should be continued until new evidence on the state of the stock is obtained.

Source
ICES Working Group for the assessment of Herring South of 62°N 2000, ICES CM 2000/ACFM:10, and 2001, ICES CM 2001/ACFM:14

Data entered/updated by (Date)
Christopher Zimmermann (21-07-00/27-06-01)

Please contact clupea@clupea.de if you like to contribute more information on this or other stocks!