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Acad activity adult algae alisol amino acids animals aquatic bacteria Biol biological Calif cells changes Chlorella chlorophyll Comp cone copepods crab Crustacea culture cycle cytoplasm Decapoda decrease described discussed distribution ecological effect eggs Endocrinol enzyme extracts factors fauna feeding fish French freshwater frog gastropod gland growth hormone Ikhtiol increased indicated inhibited Inst investigated isolated Japan Lake larvae layer lipids marine maturation membrane ment metabolism molluscs morphological muscle nerve neurons normal observed occur Oceanogr oocytes organisms Osteichthyes Physiol phytoplankton pigment pituitary plankton polychaete population potential present production prolactin protein Rana region response river salinity salmon samples sea water showed sp.n spawning species specimens spermatogenesis stages structure synthesis teleost temp thyroxine tion tissue Univ USSR vitro Zool zooplankton