부산대학교 도서관

The relationship between scale and body growth for emigrating Atlantic salmon, Salmo salar, smolts was previously not understood and therefore was examined in this study using mark-recapture techniques. The size of smolts at time of recapture was significantly greater than when marked (P = 0.0002). The growth in length of smolts emigrating 5 km over an average of 20 days was 7.7 +- 6.1 mm per day. Instantaneous somatic growth (G .sub.body) ranged from 7.0 x 10.sup.-4 to 5.1 x 10.sup.-3 (mean = 2.7 x 10.sup.-3 +- 1.3 x 10.sup.-3). The mean number of plus growth circuli present per scale was significantly greater for smolts when recaptured compared to when marked (P = 0.0014). The instantaneous growth rate of scales (G .sub.scale) ranged from 1.4 x 10.sup.-3 to 11.5 x 10.sup.-3 (mean = 6.6 x 10.sup.-3 +- 4.3 x 10.sup.-3). The relationship between body size and scale radius showed positive allometry rather than isometry. The relationship of G .sub.scale with G body .sub.showed positive allometry indicating that scales grew at a slightly faster rate than the body during the emigratory period.