The Journal "Agriculture and Forestry"
Časopis "Poljoprivreda i šumarstvo"
- Since 1955 -
Year 2022, Volume 68 Issue 2 (30.06.2022)
| Year : | 2022 |
| Volume : | 68 |
| Issue : | 2 (30.06.2022) |
| Authors : | Vasil KOLEV |
| Title : | GROWTH RATE OF SQUALIUS ORPHEUS (KOTTELAT AND ECONOMIDIS 2007) IN THE RIVERS CHEPINSKA AND VACHA |
| Abstract : | This paper presents a study of Orpheus dace (Squalius orpheus) populations from the rivers Chepinska and Vacha, right tributaries from the middle zone of the Bulgarian part of the Maritsa River’s watershed. The research was conducted in the summer and autumn months of 2006–2011. A total of 470 specimens of Orpheus dace from the Chepinska River were caught. The study material from the Vacha River is relatively small. It includes 61 individuals. Fish populations from both rivers are characterized by disturbed age structure and predominance of young individuals. The average body length by size class was calculated using a relationship between the average values of L (standard length) and S (scale radius). The analysis showed that fish grow faster in their first year. A back calculated standard length of the Chepinska River fish is as follows: year 1: 50 mm, 2: 82mm, 3: 131 mm an 4: 192 mm. In the Vacha River it is - 1: 42 mm, 2: 78 mm, 3: 118 mm, 4: 149 mm and 5: 175 mm. Two hundred mm long individuals in the Chepinska River have average weight 80g and in the Vacha River - 126g. As it concerns these two rivers, the study found that fish growth in length and weight is relatively low in comparison with many other Bulgarian water bodies. |
| For citation : | Kolev, V. (2022). Growth rate of Squalius orpheus (Kottelat and Economidis 2007) in the rivers Chepinska and Vacha. Agriculture and Forestry, 68 (2): 109-120. doi:10.17707/AgricultForest.68.2.08 |
| Keywords : | agritourism, Orpheus dace, size-age composition, growth in length, growth in weight |
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