Fishery Investigations

100 hours fishing abundance age-groups average batch Bear Island bottom breeding Brightlingsea catch caught cent Crepidula Crouch cultch density depth distribution drift ports drift-nets East Coast echo-sounder eggs experimental shells experiments fathoms fecundity Figure fishery fishing effort fishing fleet fishing grounds Frisian Frisian Coast gross tons growth Haaks hake Hauled Helford River Heligoland Horns Reef increase July June Jutland Coast Kessingland Korringa larvae length limpets low water marked plaice mesh metres Milford Haven months mussels Mytilicola Nassarius North Sea number of spat numbers of larvae observations occurred Ostrea edulis oyster grounds oyster larvae Paglesham pareja pilchards plaice marked plankton pre-war recaptured recorded ring-net River River Crouch Roach samples Schiermonnikoog season ship shoals Shot shown shows small hake sounder Southern Bight Southward Laying spatfall spawning species sprats stownet surface Table tank tiles trawl trawlers vessels water temperatures yield ΙΟ