Study of pike-perch (Sander lucioperca) fishery from Razim Lake, Danube delta Romania
Journal Title: Scientific Annals of the Danube Delta Institute - Year 2018, Vol 23, Issue
Abstract
The Razim Lake is a great part of the Danube Delta Biosphere Reserve (DDBR), with a surface of 54,000 ha. Fish fauna from Razim lake include pike-perch (Sander lucioperca) as one of the main top predators of fish community, however ecological significance indicates accessory species, recedent as dominance, sometimes been subrecedent species like in 2011 and 2012 sampling, but constant species regarding frequency in sampling. Otherwise, pike-perch is an important value DDBR fishery species with an average of 5% in total catch, range 2-10%, from what Razim lake contributes with average 71%, range 41-95% in the 1960-2015 period. Razim Lake has been in average 13%, range 1-40% from total Razim lake catch, in the same period of time. Since in RBDD has been fishing up to 2000 fisherman, in Razim lake activated up to 500 fishermen, however nowadays number of fishermen was regulated at lower range. Catch data series shows a continuous stock decline trend, considered to be a consequences of habitat degradation and over-exploitation. Fish stock estimation in last 15 years (2001-2016) support the hypothesis of over-exploitation. Based on length frequency structure of landings, the growth and exploitation parameters have been estimated as well as the average biomass and the maximum sustainable yields for the Razim lake pike-perch stock. Recommendation concerning fisheries management towards sustainable fishing of pike-perch stock, as increasing of cod-end seine mesh size and decreasing of fishing effort regulation are outlined.
Authors and Affiliations
CERNISENCU IRINA, NAVODARU Ion, NASTASE Aurel, COCIAS Stefan
Keywords
Related Articles
- EP ID EP288280
- DOI 10.7427/DDI.23.03
- Views 118
- Downloads 0
Spatial and seasonal variations of heavy metals in water and sediment samples collected from the Lower Danube River
Surface water pollution with heavy metals represents one of the most relevant environmental issues, with severe outcomes on every other environmental compartment, affecting therefore the human health because of their tox...
Algal biomass – a viable source for biogas and biodiesel
Algal biomass has been found to contain high levels of lipids and high quality polyunsaturated fatty acids, as well as many other organic compounds, that made this wide spread natural resource to be of great interest in...
Ecological quality assessment of Eastern Black Sea streams of Turkey: a case study of Firtina, İkizdere and Çağlayan
The main aim of this study is to understand the seasonal changes in the selected rivers of the Eastern Black Sea water quality by using physico-chemical parameters (temperature °C, pH, conductivity), Dissolved Oxygen, Ch...
Phytolankton assessment in Danube Delta Biosphere Reserve
The term ”plankton” refers to those microscopic aquatic forms having little or no resistance to currents and living free-floating and suspended, in open or pelagic waters. Phytoplankton development has different conseque...
Quality of running water from Dniester river hydrographic basin (in limits of the Republic of Moldova)
The paper presents the results of studies focused on the quality parameters of Dniester river and its tributaries. Selfpurification capacity of the running waters in the studied area has average values of 0.30 - 0.35. Wa...