Impact of Demersal Fishery and Evidence of the Volterra Priciple to the Extreme in the Adriatic Sea

An explanation of recorded changes as a consequence of increasing harvesting effort during the 50 years of fishery between the two sets of cruises was provided. Comparison of demersal fish stock during two sets of cruises in the Adriatic Sea, Hvar, 1948-1949 and MEDITS 1996-1998 showed significant changes. The catch on each set of cruises was a good indicator of standing stock of fish since the trawler nets took almost all the fish greater than 3.6 cm in case of Hvar cruises and greater than 2 cm during MEDITS cruises. The fleet fishing on the east Adriatic close to the coast was much smaller of the one on the rest of the Adriatic Sea. In the case of indiscriminate fishing on prey and predator, the claim was that the maximum sustainable yield did not exist in the Lotka-Volterra model.