Samples of tench. Tinca tinca (L., 1758), were taken from Lake Vegoritis, northern Greece (40°45′N, 21°47′). Fish age was determined by comparing different skeletal elements (i.e., scales, opercular bones, and vertebrae). Determination of age from the scales resulted in an overestimation of 1 year in 1.9% and an underestimation of 1 year in 3.2% of the cases when compared to age as determined from opercular bones. In the opercular bones of older specimens, the first and some of the second annuli were not easily discernible. A comparison of readings derived from vertebrae and opercular bones revealed that age determined from vertebrae was both overestimated and underestimated by the same percentage (2.5%). Consequently, using scales to determine age in tench is not recommended for inexperienced researchers, unless the annual rings for ages ⩾3 years, are compared with those of the opercular bones and vertebrae.
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Samples of tench. Tinca tinca (L., 1758), were taken from Lake Vegoritis, northern Greece (40°45′N, 21°47′). Fish age was determined by comparing different skeletal elements (i.e., scales, opercular bones, and vertebrae). Determination of age from the scales resulted in an overestimation of 1 year in 1.9% and an underestimation of 1 year in 3.2% of the cases when compared to age as determined from opercular bones. In the opercular bones of older specimens, the first and some of the second annuli were not easily discernible. A comparison of readings derived from vertebrae and opercular bones revealed that age determined from vertebrae was both overestimated and underestimated by the same percentage (2.5%). Consequently, using scales to determine age in tench is not recommended for inexperienced researchers, unless the annual rings for ages ⩾3 years, are compared with those of the opercular bones and vertebrae.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 283 | 58 | 9 |
| Full Text Views | 8 | 0 | 0 |
| PDF Views & Downloads | 6 | 0 | 0 |