びわ湖における陸封型アユの変異性に関する研究 : I.発育初期の分布様式と体形変異について
STUDIES ON THE VARIABILITY OF THE LANDLOCKED AYU-FISH, PLECOGLOSSUS ALTIVELIS T. ET S., IN LAKE BIWA : I. ON THE MODE OF DISTRIBUTION AND SOME BODY FORM VARIATION AT EARLY PHASES OF DEVELOPMENT

Mikio AZUMA
1970 Nihon Seitai Gakkaishi  
The morphological developmellt , glQwth and change in distr 三 bution pa 宅tern of the Ayu ・ 丘sh in Lake Biwa were studied . In the earlier phases when the body form variation 五 s Dot so clear , the distr 童 bution of the larvae is passively determined by water current . The differentiation in the body form starts with the further developed larvae and they agg regate areund the subaqueous terrace . As the differentiation becomes clearer , the 丘sh can be clbssi 丘ed into two groups by the 三 r body
more » ... s by the 三 r body form,三 . e りthe running water type and the standing water type. The former migrates toward the Iittoral area whi 互 e the latter remains in the deeper pa 質 . The relation between morphological development and growth reverses 重 tself at about th 三 5 phase ; the fish of the running water type which have been ' ' more developed but less grown
doi:10.18960/seitai.20.2_63 fatcat:5iopswblczamjikjl6rhfe4yei