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Postembryonal growth and its variability of the three marine fishes with special reference to the mechanism of growth variation in fishes
Author(s) -
Yamagishi Hiroshi
Publication year - 1969
Publication title -
population ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 59
eISSN - 1438-390X
pISSN - 1438-3896
DOI - 10.1007/bf02514507
Subject(s) - biology , demersal zone , cannibalism , growth curve (statistics) , zoology , population , coefficient of variation , ecology , pelagic zone , statistics , demography , mathematics , larva , sociology
Summary To study the relation of growth variation to the behaviour pattern, newly hatched Hemiramphus sajori, Chrysophrys major and Zebrias zebra were reared in 30 litter aquaria during one month, and body length was measured four times. In Hemiramphus sajori coefficient of variation of body length ( CV ) first increased but showed a tendency to decrease with development of schooling behaviour. In Chrysophrys major CV markedly increased and mode of the distribution curve of body length inclined towards the left side, associated with appearance of aggression and cannibalism. In Zebrias zebra , when behaviour pattern changed from planktonic to demersal some of the small individuals nearly ceased growing. At that time CV of body length remarkably increased and the mode of the distribution curve of body length shifted towards the right side. In all the species a positive correlation was seem between specific growth rate and initial body length soon after intensive feeding began. An negative correlation was observed in most of individuals of Hemiramphus sajori after the appearance of schooling behaviour. When a conspicuous increase in CV and skewness in distribution curve took place, a separate type of correlation was seen in large and small group in the population. Based on above mentioned and other materials a general mechanism of growth variation in fishes was discussed.