遺傳及耳石微化學標記在兩側洄游型及瀕危經濟性魚類族群管理的應用(1/3)
Date Issued
2005-07-31
Date
2005-07-31
Author(s)
曾萬年
DOI
932313B002114
Abstract
Anguilla anguilla elvers have been restocked in Lithuanian waters and mixed with
naturally recruited eels for several decades. Otolith Sr:Ca ratios were examined to
evaluate the contribution of the exotic eels to the native eel population. Restocked eels
were identified by the freshwater signature (Sr:Ca ratios < 2.24 × 10-3) on the otolith
after glass eel stage. Naturally-recruited eels, that had migrated through the North and
Baltic Seas, were characterized by an extended seawater signature (Sr:Ca ratios > 3.23
× 10-3) after the glass eel stage. Of 108 eels analyzed, 21 eels had Sr:Ca ratio profiles
consistent with restocking while 87 showed patterns of natural recruitment. Eels from
the inland lake Baluošai were all freshwater residents of restocked origin. However,
restocked eels accounted for only 20% of the eel from the Curonian Lagoon and 2%
of eels sampled in Baltic coastal waters. This finding does not support the hypothesis
that eel fishery in the Curonian Lagoon mostly depends on restocking. This study
demonstrates the application of otolith microchemistry in discrimination of mixed
population and evaluating the stocking effectiveness of diadromous fishes.
Subjects
European eel
Anguilla anguilla
Otolith microchemistry
Migratory
history
history
Restocked eel
SDGs
Publisher
臺北市：國立臺灣大學漁業科學研究所
Type
journal article
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