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- W2095494093 abstract "The occurrence of first zoeae of king crab Paralithodes camtschatica (Tilesius) and potential phytoplankton food was monitored during April 1987 in Auke Bay, Alaska. The most abundant phytoplankton were Thalassiosira spp. and Skeletonema costatum (Greville) with fewer Chaetoceros spp. Copepod nauplii were the most abundant Zooplankton. Laboratory experiments were done to see if these potential foods, at concentrations simulating those observed to coexist with the larvae, could provide first-feeding king crab zoeae with a positive energy balance. The percentage of zoeae I molting to stage II when grazing on pure cultures of T. nordenskioldii Cleve (4000 cells · ml−1), C. debilis Cleve (2400 cells · ml−1) and S. costatum ( 16 000 cells · ml−1 ) were 96, 5 and 27 %, respectively. Thalassiosira spp. concentrations in the chlorophyll maximum were up to 10 times higher than necessary for 100% of the larvae to molt successfully to stage II. S. costatum was abundant enough in the chlorophyll maximum layer to provide supplemental energy for the zoeae. Chaetoceros spp. were not abundant enough to allow the zoeae to molt if that genus was the sole source of energy. While the percentage of zoeae molting to stage II showed some relationship to cell concentration or algal taxon, these factors had no effect on development time, even at concentrations less than optimal. The first zoeae were not efficient at capturing copepod nauplii or barnacle nauplii when they existed at abundance levels observed in the bay. The results indicated that some diatom taxa are an important energy source for first-feeding king crab larvae and that hatching concurrently with the spring phytoplankton bloom may be an important factor affecting their survival. Factors which modify phytoplankton species succession and formation of a strong chlorophyll maximum layer during the planktonic phase of larval king crab may also be important in determining survival of first feeding larvae." @default.
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- W2095494093 title "Energy sources for first-feeding zoeae of king crab Paralithodes camtschatica (Tilesius) (Decapoda, Lithodidae)" @default.
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- W2095494093 doi "https://doi.org/10.1016/0022-0981(89)90018-x" @default.
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