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We intended to estimate if shallow inshore waters of the Gulf of Gdańsk can be considered important feeding grounds for the fishes under investigation. We also examined whether competition for food exists between the investigated fishes which co-exist. The study was carried out at Sopot and Chałupy stations from summer 2001 to autumn 2003. The results showed the high importance of Neomysis integer, which exclusively lives in coastal waters, in the diet of all three investigated fish species. It indicates that they utilize this zone as a feeding ground. The obtained dataset also led to the conclusion that fish trophic niches overlap by about 40%.
A study was conducted from 2001 to 2003 in the Gulf of Gdańsk (Poland) on the diel food composition and diel and seasonal changes in the feeding activity of Pomatoschistus minutus, Pomatoschistus microps, and Platichthys flesus. During the three-year study, no empty fish stomachs were noted, and the fish food was comprised exclusively of prey species that inhabit the shallow water zone (e.g., Bathyporeia pilosa). It can also be stated that the shallow waters of the Gulf of Gdańsk are an important feeding ground for Pomatoschistus sp. and P. flesus. The food intake of all three investigated fish was lower at night than during the day, which led to the conclusion that these fish are day feeders. The seasonal feeding intensity of the sand and common gobies was approximately the same throughout the investigation but was higher in April, June, and August, and lower in September. The flounder fed most intensively in August and March, while feeding intensity was lower in May and June. In September 2001, the most important prey items for P. minutus were Amphipoda undet. and Mysidacea undet. in the morning, N. integer and Mysidacea undet. at noon, and Harpacticoida and Copepoda undet. in the evening. In the same month, P. microps fed mainly on B. pilosa at 08:00, N. integer at 00:00, and Harpacticoida at 20:00. From 2001 to 2003, P. flesus preyed mainly on Polychaeta in the morning hours, while in the evening it targeted N. integer according to the prey frequency of occurrence and quantity in the fish stomachs.
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