Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2003
Volume 6
Issue 2
Topic:
Fisheries
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Skrzypczak A. , Mamcarz A. 2003. ANALYSIS OF FISHERY EXPLOITATION PARAMETERS OF LAKES AND ASSESSMENT OF THEIR SUITABILITY FOR OBSERVATION OF TRENDS IN FISH CATCHES, EJPAU 6(2), #03.
Available Online: http://www.ejpau.media.pl/volume6/issue2/fisheries/abs-03.html

ANALYSIS OF FISHERY EXPLOITATION PARAMETERS OF LAKES AND ASSESSMENT OF THEIR SUITABILITY FOR OBSERVATION OF TRENDS IN FISH CATCHES

Andrzej Skrzypczak, Andrzej Mamcarz

 

ABSTRACT



Long-term studies on catches from 757 lakes in northeastern Poland served to analyse fishery exploitation parameters available from the records in lakes books. Yield (kg.ha-1), annual frequency of exploitation and relative catch (kg.ha-1.month-1) were analysed in five size classes of lakes, together with the relations occurring between these parameters. Linear correlation was determined between yield versus the number of months of exploitation when the catches were made and relative catch. The latter parameter was characterised by a slightly smaller variability of real values and consequently by a higher concentration along the adjusted trend line compared to the catch per lake area unit.

Key words: fishery exploitation, yield, frequency of exploitation, relative catch, intensity of exploitation, lakes, northeastern Poland..