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The distribution and abundance of cephalopod species caught duringdemersal trawl surveys west of Ireland and in the Celtic Sea
Weitere Beteiligte (Hrsg. etc.): Lordan, Colm
|BK - Klassifikation:
||21.3 Küsten- und Hochseefischerei
|Sonstige beteiligte Institution:
||Marine Fisheries Services Division, Marine Institute
||Bericht / Forschungsbericht / Abhandlung
||Irish Fisheries Investigations (Bd. 3-15, 17-20, 24)
|Kurzfassung auf :
||Distributional and abundance data on seventeen cephalopod species from three
demersal trawl series are presented. Data from one the CEFAS March Celtic Sea
Groundfish Survey cover the years 1994-1998 inclusive and a depth range of 57-580 m.
Data from two Marine Institute surveys was for October-November 1997 only. One of
these surveys was west and south west of Ireland between depths of 27-328 m, the other
was conducted in deepwater (520-1174 m) to the northwest. Eleven cephalopod species
were caught (14,981 individual cephalopods) during the five CEFAS surveys. Spatial
and bathymetric distribution data are presented for the species caught and the interannual
variability is discussed. The most numerous species in catches was Loligo
forbesi (n = 6,803), however, the highest biomass caught was Illex coindetii (418.3kg).
Alloteuthis subulata were common close to shore in water depth of less than 75 m.
Swept area density estimates are reported for the most abundant species in catches. Ten
cephalopod species were caught during the Marine Institute west coast groundfish
survey (774 specimens were examined out of an estimated 8,712 caught). The results
show broadly similar patterns in species composition, distribution and abundance to the
CEFAS survey. Todaropsis eblanae was the second most numerous species in the
survey. Only six cephalopod species (n =196) were caught in the Marine Institute
deepwater trawl survey. Todarodes sagittatus was the most common species caught.
Deepwater octopods including Benthoctopus piscatorum, Benthoctopus ergasticus and
Opisthoteuthis massyae were also caught. This chapter provides a base line of data on
cephalopod species which are caught in trawl surveys west of Ireland and in the Celtic