. Commercial fisheries review. Fisheries; Fish trade. 15. Cape Ann to Grand Manan Channel, from the headlands to the 50-fathom isobath (seechart). Area of investigations of R/V Rorqual Cruise 7-66, The following are some preliminary find- ings: The average concentration of zooplank- ton along the coast, , was lower than in the preceding four autumn seasons. Average volumes decreased from west () to east'(). Cope- pods and cladocerans were the dominant zoo- plankters (89% of total). Of 14 copepodspe- cies in the samples, 4 dominated the catches-- Centropages ty
. Commercial fisheries review. Fisheries; Fish trade. 15. Cape Ann to Grand Manan Channel, from the headlands to the 50-fathom isobath (seechart). Area of investigations of R/V Rorqual Cruise 7-66, The following are some preliminary find- ings: The average concentration of zooplank- ton along the coast, , was lower than in the preceding four autumn seasons. Average volumes decreased from west () to east'(). Cope- pods and cladocerans were the dominant zoo- plankters (89% of total). Of 14 copepodspe- cies in the samples, 4 dominated the catches-- Centropages typicus (74% of the total), Oithona similis (9%), Calanus finmarchicus (6%), and Temora longicornis (3%). Dense patches of phytoplankton were encountered all along coast. Two dinoflagellate species, Ceratium longipes and C. fusus, occurred most fre- quently in samples and apparently were phyto- plankters producing the autumn bloom en- countered. The samples had 1,442 larval fishes, 1,393 of them herring--ranging from mm to mm; average length was mm. Surface temperatures were seasonally normal, ranging from ° C to ° C. As in previous autumns, vertical mixing of wa- ter column increased from west to east. "RORQUAL" ESTIMATES ABUNDANCE OF LARVAL HERRING The purpose of the Rorqual cruise of Oc- tober 17-27, 1966 (Cruise 8-66) was to es- timate the abundance and vertical distribu- tion of larval herring and their association with water types. The area of operation was , , 1 , }k mS ^A - Boothbay Lab / 1 ilU J n^i s^g ,. â ) - / ^ ju^ S0»^°^'' .... 'i. ... V, r ig;'^'^ CAPE ANN GULF of MAINE -â \ *> ~ ,. ',â .'.â .â -â -â ..- »⢠.'. ,-i- .â ,. Approximate location of recently hatched larval herring (R/V Rorqual Cruise 8-66). Two tows each were made at 46 stations with a Gulf III sampler. One tow was made at a station in Grand Manan Channel. The distribution of herring larvae above and be- low 20 meters was sampled at three stat
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