Otolith microstructure of brown sole <Emphasis Type="Italic">Pseudopleuronectes herzensteini</Emphasis>: validation of daily ring formation and the occurrence of microstructure denoting metamorphosis |
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Authors: | Mikimasa Joh Taihei Matsuda Nobukazu Satoh Nobuyuki Tanaka Yoshiyuki Ueda |
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Institution: | (1) Abashiri Fisheries Experiment Station, Hokkaido Research Organization, Masu-ura, Abashiri Hokkaido, 099-3119, Japan;(2) Mariculture Fisheries Experiment Station, Hokkaido Research Organization, Funami, Muroran Hokkaido, 051-0013, Japan |
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Abstract: | Brown sole Pseudopleuronectes herzensteini larvae and juveniles were reared to validate daily otolith ring formation. At 15°C, a check (a distinct ring) formed on the
sagittae and lapilli at 6 days after hatching, and clear increments regularly formed outside the check. For both otoliths,
the relationship between the number of days after hatching and number of increments was linear, and the slope of the line
was approximately 1; therefore, daily formation was validated. At 12°C, the check formed on the lapillus 8 days after hatching.
Accessory primordia (AP) began forming on the sagittae of metamorphosing larvae, and the shape of the sagittae became complicated.
AP were not formed on the lapillus; concentric rings were formed throughout larval and juvenile stages. Wide and obscure increments
formed on the lapilli during metamorphosis (metamorphosing zone, MZ). Based on MZ, concentric rings that have formed on the
lapilli of juveniles can be separated into larval and juvenile rings. The morphs of large juveniles’ lapilli were bilaterally
asymmetric, and the blind-side lapilli were most suitable for otolith microstructure analysis. This study provides fundamental
information for otolith microstructure analysis in wild brown sole. |
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