The larval preference for substrata which were coated by the cultured attaching diatoms, Navicula ulvacea, N. sp. and Achnanthes brevipes was studied through a choice test to clarify the relationship between the preference for the settlement and the attaching diatom. These attaching diatoms were cultured in a unialgal condition. The settlement index was defined as the difference between the numbers of larvae which settled on the film-coated and not film-coated glass slides.The index was obtained for the effect of the attaching diatom film and attaching bacteria which propagated on the glass slides together with the attaching diatom.
There was a semi-logarithmic linear relationship between the settlement index and the density of each attaching diatom over a certain level of density. We thought that the larvae preferred the cultured attaching diatom for the settlement, because there was no clear effect of only attaching bacteria on the settlement.
- Nippon Suisan Gakkaishi is an official journal of the Japanese Society of Fisheries Science written in Japanese only.
The society publishes an English journal, Fisheries Science, as well, which accepts submissions from non-members of the society over the world. Detailed information is available in http://jsfs.jp/en/journals/fisheries-science.