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The Assessment of Size‐class Proportions and Fisheries Mortality of Eel Using Various Catching Equipment
Author(s) -
Berg R.
Publication year - 1990
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19900750611
Subject(s) - electrofishing , fishery , stock assessment , stock (firearms) , fishing , statistics , population size , mathematics , environmental science , population , geography , biology , fish <actinopterygii> , demography , archaeology , sociology
Samples of approximately 11,000 eels were used to analyse the size class composition of the eel stock in Lake Constance (Bodensee). The main statistical approach was to separate a ‘stock dependent fraction’ within the length frequency distributions obtained from three different traps and two electrofishing methods. From the calculated size class proportions an average total mortality of 28.5% was estimated for eels bigger than 50 cm opposed to 26% total mortality for the unfished part of the population.