The changes in body length and weight in fish of different natural mobility, depending on the season and sex of the individuals, were studied. It was revealed that seasonal changes in the size and weight indicators of the fish bodies are characterized by an increase in their values in autumn in bottom and demersal sedentary species (East Atlantic peacock wrasse (Symphodus tinca), scorpionfish). The belonging of the studied sample of sedentary species to the same population allows conducting studies on changes in body size-weight indices of the S. tinca and scorpionfish during their annual life cycle accurately. Female scorpionfish and male S. tinca had the highest size-weight indices during the season. For schooling, active fish (horse mackerel, smarida, weasel), this method is not correct as it is impossible to research one population in the studied sample during their migration. The studied sedentary species had more pronounced changes in body weight indices by season and sex. Thus, the weight indicators of sedentary fish were 1.5 times higher than their changes depending on sex. The obtained size-weight results confirm two fundamentally different feeding strategies in the S. tinca and scorpionfish. The sedentary scorpionfish uses an ‘intensive’ strategy. The possibility of implementing this strategy in the scorpionfish is due to the fairly high density of their potential prey per unit area of the species’ habitat. In the event of a drop in prey density, this strategy may be significantly ineffective and could result in a substantial limitation of opportunities for this fish species. The more mobile, bottom-dwelling S. tinca has an ‘extensive’ strategy due to a high intensification of food consumption and a more active metabolism. The extensive feeding strategy characteristic of the S. tinca implies the exploitation of larger areas of the coastal bottom seabed and, consequently, more intensive feeding throughout the entire annual cycle of fish. However, this method of foraging food by S. tinca requires high energy costs, which significantly affects the rate and magnitude of the increase in their body size and weight characteristics.
fish, size, weight, sex, season, Black Sea, South-Eastern Crimea
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