カタクチイワシの成長に伴う脳髄形態の変化

概要

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The morphological changes of the brain of anchovy were elucidated in connection with its growth and then discussed in relation to the changes of behaviour. The results obtained are summarized as follows: 1) The three stages may be recognized from the view of morphological changes in each part of the brain. (a) The 1st stage: “Shirasu” stage, less than 30mm in total length, when lobus opticus is exclusively large (and the other parts of the brain are not developed). (b) The 2nd stage: The stages from 40-60mm in total length when lobus opticus, each part of cerebellum, and saccus vasculosus are of adult type and when schooling behaviour and sight feeding behaviour are developed. (c) The 3rd stage: The stage over 70mm in total length when every part of the brain obtains adult type. 2) Judging from the above mentioned results, there seems to be a close relation between the changes of behaviour of anchovy and morphological ones of its brain, especially distinct in lobus opticus, corpus cerebelli, valvula cerebelli, and saccus vasculosus.
社団法人日本水産学会の論文