Additional Fisheries Data on Pontic Shad (Alosa Immaculata) one of the Main Fish Resources of the Danube-Black Sea System
Abstract:
The latest data on the Pontic shad fishery of the Danube-Black Sea system comes from the year 2024, based on a sequence of steps including field studies, analyses for over 1100 adult migratory individuals from commercial catches, scales taken from significant number of individuals for age structure and observations of sex structure, gonad maturity and IAL (index of larval abundance) as an indicator of reproductive success. The most important f ish stock parameters are growth, recruitment, natural mortality and fishing mortality for the deltaic fisheries in cluding the Pontic shad fishery. Spatially, the population of Pontic shad is interpreted as a system with two main compartments: the stock in the western and south-western Black Sea and the cycling compartment, represented on the one hand by sexually mature individuals migrating to the Danube to spawn and on the other hand by juveniles, the result of reproduction, entering the stock. As this is a migratory stock, for practical reasons and due to the un certainties caused by the different results of the assessment models, it is not recommended to intensify the fishery or to reduce the mesh size, but only to fish in a way that avoids catches below the minimum allowable size, even if the results of 2024 are much better than those of the last three years.
