Qualitative and Quantitative Structure of Alosa Populations at the Romanian Black Sea Coast

TIGANOV, George; MAXIMOV, Valodia; OPREA, Lucian; (CĂLIN) SANDU, Petronela G.
July 2013
Bulletin of the University of Agricultural Sciences & Veterinary;2013, Vol. 70 Issue 2, p359
Academic Journal
The most important resource traditionally exploited for commercial purposes is the fishery resource. Marine biological resources are essential for the survival of humanity, but, as it is well known, although they are renewable, they are not infinite and therefore must be managed properly. Fishery resources are affected both by the changes occurring in natural environmental conditions and by changes in environmental conditions as a result of human activities. In the past few years, the anthropogenic causes that led to severe changes in fish populations from the Romanian coast partly persisted, but some have occurred with less intensity, as follows: the environmental conditions in the coastal area are still quite poor, reflected by fishing clusters traveling offshore during the warm season; the influence of hydrotechnical structures on the Danube on sturgeon breeding and shad, in general, and Pontic shad, in particular, is maintained; the use of inappropriate fishing gear and techniques; illegal fishing of breeding clusters. In the Romanian marine sector, the species structure of catches partly reflects the fish fauna composition, as the ratio of fished species is conditioned primarily by two factors: the type of fishing gear and the seasonal conditions of forming and maintaining fishing clusters. Fishery research conducted in 2011-2012 mainly aimed at reaching the correct knowledge and estimation of the dynamics of the Black Sea potential, in order to ensure the necessary data volume for stock management and exploitation under sustainable conditions. This research focused on collecting data and information on environmental conditions that directly affect fisheries, seasonal distribution of exploitable clusters, the qualitative and quantitative composition of catches, the biology of the main Alosa species caught in the Romanian marine area. The research works performed are meant to lead to the knowledge of the current state of Alosa populations and were conducted along the entire Romanian Black Sea coast, in almost all fishing points, by organizing both expeditions along the coast (gillnet fishing) and sea surveys (pelagic trawl fishing). The paper refers to the qualitative and quantitative composition of catches, as well as the length and weight class structure, age, sex ratio, degree of maturation, length/weight relationship for the Alosa species which populate the Romanian coast, under hydroclimatic conditions specific or the analyzed period.


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