Characteristics of circuli profile deposited on fish scales of red sea bream and black sea bream
2005
Ezoe, S.(National Fisheries Univ., Shimonoseki, Yamaguchi (Japan)) | Nagao, K. | Ohta, H. | Imai, C.
It is important to evaluate the age and the growth carrier statistically for the management of fish resources. The authors developed a convenient and a useful tool to measure circuli deposited on fish scale easily by surface profilometer and to analyze the measured circuli data by personal computer processing. Specimens used in this study were of natural fishes of red sea bream and black sea bream that were caught by set net fishing in Senzaki bay facing Japan Sea in Yamaguchi Prefecture. Then,it was carried out that the number and the pitch of circuli deposited on the scales of respective fishes were analyzed minutely. The results obtained were as follows; 1) The depositing circuli number of each fish were proportional to the scale size and the proportional tendency of respective fishes were almost the equivalent. 2) The circulus pitch of Madai was changed wavy depending on the growing, on the other hand, that of Kurodai was deposited almost in even interval.
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