Annual Variation of Growth Increment of Red Sea Bream Pagrus majar.

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  • マダイの年成長量の年変動
  • マダイ ノ ネン セイチョウリョウ ノ ネン ヘンドウ

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Abstract

In order to examine the relationship between sea water temperature and annual growth of red sea bream caught in the waters around the Oosakikamishima Island in the middle of Seto Inland Sea, the body length was estimated when each annual ring was formed on a scale, then the calculated body length of each age group from 1980 to 1986 was compared. The calculated body length was obtained from the expression FLi=(FL-b)×ri/R+b. The total deviation of the water temperature was calculated using the average daily water temperature during the growing season from May to November. The annulus formation time was from May to July and differed with water temperature during winter. The annulus formation indicates the time when growth begins after winter. The equations estimated by the least squares method for annual growth at age I (years), say Δ1I(mm), and the total deviation of the water temperature (T: °C), were Δ10=118.8+0.6•T, Δ11=64.7+0.3•T, Δ12=46.2+0.3•T, and Δ13=36.5+0.2•T, which were statistically significant (p<0.01). The values of the regression coefficient decreased with age. Furthermore, a significant correlation was detected between temperature and the lengths at the annulus formation for ages 1 to 3 years old.

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