Growth and morphological development of sagittal otoliths of larval and early juvenile Trachurus japonicus
Identifieur interne : 000938 ( Main/Exploration ); précédent : 000937; suivant : 000939Growth and morphological development of sagittal otoliths of larval and early juvenile Trachurus japonicus
Auteurs : S. Xie [Japon] ; Y. Watanabe [Japon] ; T. Saruwatari [Japon] ; R. Masuda [Japon] ; Y. Yamashita [Japon] ; C. Sassa [Japon] ; Y. Konishi [Japon]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 2005-06.
English descriptors
- KwdEn :
Abstract
The daily periodicity of growth increment formation in sagittal otoliths of jack mackerel Trachurus japonicus was validated by marking otoliths with alizarin complexone (ALC). Analysis of otoliths of known‐age juveniles confirmed that the first increment formed on day 3 after hatching, and was associated with first feeding. A total of 198 specimens, ranging from 2·6 to 49·2 mm in body length (notochord length or standard length) and from 7 to 78 days in age, were collected in the East China Sea and Tosa Bay, and used to examine the association between otolith morphological development and ontogenetic development. The relationship between body length (L) and otolith radius (R) was significantly described by the linear function L = 2·65 + 0·0425R(n = 198, r2 = 0·99, P < 0·001), indicating that somatic growth history can be reconstructed from otolith growth patterns. The otolith was primarily spherical in the preflexion larval stage, and became elongated with notochord flexion. The first secondary primordium formed at c. 25 days, during the middle postflexion stage, and was associated with metamorphosis. By c. 42 days the sagittal otolith was adult‐like in morphology, with the primary growth zone enclosed by the marginal growth zone, except in the anterior rostrum area. Thus age, growth and developmental stages were recorded in sagittal otoliths during the larval and early juvenile stages of jack mackerel.
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DOI: 10.1111/j.0022-1112.2005.00717.x
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Analysis of otoliths of known‐age juveniles confirmed that the first increment formed on day 3 after hatching, and was associated with first feeding. A total of 198 specimens, ranging from 2·6 to 49·2 mm in body length (notochord length or standard length) and from 7 to 78 days in age, were collected in the East China Sea and Tosa Bay, and used to examine the association between otolith morphological development and ontogenetic development. The relationship between body length (L) and otolith radius (R) was significantly described by the linear function L = 2·65 + 0·0425R(n = 198, r2 = 0·99, P < 0·001), indicating that somatic growth history can be reconstructed from otolith growth patterns. The otolith was primarily spherical in the preflexion larval stage, and became elongated with notochord flexion. The first secondary primordium formed at c. 25 days, during the middle postflexion stage, and was associated with metamorphosis. By c. 42 days the sagittal otolith was adult‐like in morphology, with the primary growth zone enclosed by the marginal growth zone, except in the anterior rostrum area. Thus age, growth and developmental stages were recorded in sagittal otoliths during the larval and early juvenile stages of jack mackerel.</div></front></TEI><affiliations><list><country><li>Japon</li></country><region><li>Région de Kantō</li><li>Région du Kansai</li></region><settlement><li>Kyoto</li><li>Tokyo</li></settlement><orgName><li>Université de Kyoto</li><li>Université de Tokyo</li></orgName></list><tree><country name="Japon"><region name="Région de Kantō"><name sortKey="Xie, S" sort="Xie, S" uniqKey="Xie S" first="S." last="Xie">S. Xie</name></region><name sortKey="Konishi, Y" sort="Konishi, Y" uniqKey="Konishi Y" first="Y." last="Konishi">Y. Konishi</name><name sortKey="Masuda, R" sort="Masuda, R" uniqKey="Masuda R" first="R." last="Masuda">R. 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