КамчатНИРО
91
yearsKamchatka Research Institute of Fisheries and Oceanography
years
Journal / Archives
УДК 563.9: 591.3 DOI: 10.15853/2072-8212.2018.50.34-40Download the full article
Some peculiarities of the biology of the sea urchin (Strongylocentrotus polyacanthus A. Agassiz & H.L. Clark, 1907) in Avachinskaya Bay (South-East Kamchatka)
Effects of consumed forage on the changes of gonad indices and reproductive behavior ofStrongylocentrotus polyacanthusin Avachinskaya Bay (South-East Kamchatka) were studied for the first time. The work was accomplished on four stations. It was demonstrated, that intense gamete maturation and high values of gonad indices in the sea urchins colonies in vicinity of Mayachniy Cape was result of feeding on the brown seaweeds Agarum clathrusand Alaria marginata,near the Bezymyannaya Bay — on the macrophyte representatives of Phaeophyceae (Laminaria longipes). Feeding on the other than regular forage organisms (silt, detritus, fragments of crustaceans, calcareous fragments) in the sites where the sea urchins live can cause slowing production of gametes and decrease of the gonad index as a result. S. polyacanthusfrom the colonies situated among the macrophites Rhodophyta demonstrated lower gonad indices, but any changes in the dynamics of forming their gametes have not been observed. In favourable biotopes in vicinity of Mayachniy Cape and Bezymyannaya Bay the sea urchins demonstrated gonad development in May and June for spawning in August.