Abstract
3Fundacion AZTI, Herrera Kaia z/g, 20110 Pasaia, Gipuzkoa, Spain. SUMMARY: Juvenile European anchovy (Engraulis encrasicolus) has a complex incremental growth pattern that was studied using scanning electron microscope (SEM) and optical microscope observations. Daily increments were identified and related to rhythmic growth patterns while double-band structures were identified as one increment. The causes of these growth patterns are discussed.
Highlights
European anchovy (Engraulis encrasicolus) is an important species in the Bay of Biscay, both from an ecological and socio-economic point of view (Uriarte et al, 1996)
Increments were identified and related to rhythmic growth patterns while double-band structures were identified as one increment
Etched otoliths show incremental growth based on the relative differences in the organic matrix and aragonite microcrystals of the continuous and discontinuous units of the daily growth increments (Pannella, 1971; Brothers et al, 1976; Mugiya, 1977; MoralesNin, 1987)
Summary
European anchovy (Engraulis encrasicolus) is an important species in the Bay of Biscay, both from an ecological and socio-economic point of view (Uriarte et al, 1996). Growth increment (DGI) formation in otoliths has been demonstrated for juvenile and adult European anchovy (Cermeño et al, 2003). This allows the age composition and growth rate, two fundamental tools for fisheries management, of this small pelagic fish to be determined. Determining the age of European anchovy using DGI is complicated due to the likely presence of sub-daily increments, as described in larvae of Engraulis japonicus (Tsuji and Aoyama, 1984) and in Engraulis encrasicolus (Palomera et al, 1989). The second method, called Individual Mark Reading (IMR), takes into consideration every clear increment independently from its appearance
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