engleski

Stock structure, estimation of the biomass, spawning and nursery areas of the anchovy in the Adriatic Sea

This study aims to improve knowledge about abundance and spatial distribution of Engraulis encrasicolus in south-western Adriatic Sea, as well as the information related on the current genetic population structure and on how the genetic diversity has changed between generation (adult and offspring). This work consist of three parts. The first part provide useful information with regard to the spawning stock biomass of European anchovy, about fluctuations of fish biomass over a three-year period (2012, 2013 and 2014) and on the potential application of a direct method as Daily Egg production Method in the assessment process. In the second part, the attention was focused on the identification of the spawning and nursery areas of anchovy, updating their boundaries and assessing environmental and biological factors affecting the choice of spawning areas during a four-year period (2012 - 2015). In last part, microsatellite DNA markers were used to resolve the fine-scale genetic structure of anchovy to test whether the stock structure in the basin is consistent with previous findings, and in addition, the potential loss of genetic variability through parents and offspring has been investigated.

small pelagic fish, Engraulis encrasicolus, genetic variations, Adriatic Sea

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