| Autor: |
Varga, Július, Fazekas, Dorottya Lilla, Halasi-Kovács, Béla, Józsa, Vilmos, Tóth, Flórián, Nyeste, Krisztián, Mozsár, Attila |
| Předmět: |
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| Zdroj: |
BioInvasions Record; Jun2024, Vol. 13 Issue 2, p515-527, 13p |
| Abstrakt: |
Black bullhead Ameiurus melas is a widespread invasive fish in Europe and is considered an ecological and economic threat. Yet, sporadic data are available on its life-history traits. This study assessed the fecundity, growth, and body condition of black bullhead in three oxbows in Hungary. Samples were collected in the resting (October) and pre-spawning (April) periods. Considerable negative allometric growth was observed (b slope ranged between 1.64 and 1.67). The Fulton's condition factor was lower than any previously reported data (mean = 1.01; SD = 0.09). The mean male : female ratio of the three populations was 1.18:1. Mean absolute fecundity was 3,319 eggs (SD = 1521; range = 1,111-12,727), and mean relative fecundity was 78.8 eggs g-1 (SD = 21.8; range = 34.8-146.0). The mean oocyte diameter was 0.39 mm in autumn and 0.41 mm in spring. Oocyte size positively correlated with body length. The mean standard length at age was 76.5-81.00 mm at 1+, 126.23-134.35 at 2+, 153-154.5 mm at 3+, and 180-181 mm at 4+. Our results confirmed the phenotypic plasticity of black bullhead out of its native range. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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