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abundance amphipods appear April August Average number blastopore Buoy Calanus capture catch cent Chart copepods Cruise Crustacea cwts Danish Decapod December Demersal dominant length drift bottle eastern ectoderm eggs embryo endoderm English Channel fathoms February feeding figures Fisheries G. O. Sars George Bligh growth haddock hauls Horn Reef indicated January June landings large numbers larvae layer length-frequencies Light Vessel Longstone Lousy Bank Lowestoft March mesoderm Midwater Bottom miles months North Sea notochord November number caught October otter trawl Outer percentage period plaice stock plankton position post-war pre-war present pronephros proportion Pseudocalanus Rectangles region Report Rockall salinity salt water samples sand eels September shown shows small plaice Smith's Knoll Southern Bight species stations steam trawlers stomachs summer surface syncytial endoderm Table taken Temora Total townet transplantation trawl Voyage Whitebait wind winter young fish Zone