コイチNibea albifloraの年齢と成長について

概要

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In oredr to clarify the age and growth of Nibea albiflora in the Seto Inland Sea, Samples were collected during one year from the landings picked up from the Sea. Each scale removed from the sample specimen was examined and measured. The results of analysis of the annual ring on the scales show that one annulus is formed once a year, in the month of June and July. As the spawning season runs from May to August and since most specimens of fish spawn in June and July, the time of the formation of the new annulus is approximately in accordance with the spawing season. The standard lengh of this species found in the Seto Inland Sea is 151, 238, 305 and 357mm on an average at the ages of full 1, 2, 3 and 4 years, respectively, The general growth formula for this species is adequately expressed by the following equation ascribed to BERTALANFFY: Lt=529 (1-e-0.262t-0.736). The growth of the yearling immature fish was studied on samples collected in August, September and November. This growth, on the basis of an analysis of the progression of mean and mode in succesive length-frequency distributions of the immature fishes, was discussed as compared with the growth estimated from the monthly changes of the marginal growth index of the scale.
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