Effects of constant and variable salinity regimes on the occurrence, feeding, and growth of two juvenile flatfishes (Pseudopleuronectes yokohamae and Platichthys bicoloratus)

Estuarine, Coastal and Shelf Science Volume 305 Page 108872- published_at 2024-07-05
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Title ( eng )
Effects of constant and variable salinity regimes on the occurrence, feeding, and growth of two juvenile flatfishes (Pseudopleuronectes yokohamae and Platichthys bicoloratus)
Creator
Islam Tania
Macario Angelo C.
Yoshida Yusei
Takahashi Satoshi
Sakurai Gento
Source Title
Estuarine, Coastal and Shelf Science
Volume 305
Start Page 108872
Abstract
Extreme environmental conditions, such as high and low salinity, are stressors for marine fish growth. Juveniles of marbled flounder Pseudopleuronectes yokohamae and stone flounder Platichthys bicoloratus use estuaries as nursery grounds. Our field surveys showed that the occurrence of juvenile stone flounder seemed to be unrelated to salinity, whereas that of juvenile marbled flounder was positively correlated with salinity. To examine the effects of salinity on feeding and growth of these species, we conducted a laboratory experiment in which juveniles were reared individually under constant and variable salinity regimes for seven days. Cultured marbled flounder of two sizes (23–29 and 48–58 mm standard length) were reared under constant salinities of 5, 15, and 30 and fluctuating salinities of 5–30 and 15–30 or 5–15. Wild stone flounder (23–37 mm standard length) were reared under constant salinities of 1, 5, and 30 and fluctuating salinities of 5–30 and 1–30. Commercial pellets were fed to fish twice daily until satiation. The feeding and growth of marbled and stone flounders were considerably low at constant salinities of 5 and 1, respectively. Meanwhile, suppression of feeding and growth was not observed in fish with salinities varying from 5 to 30 or 1 to 30, respectively. The results indicated that extremely low salinity inhibits feeding and growth of juveniles only with continuous exposure. Estuaries with fluctuating salinities are potential nursery grounds for both marbled flounder and stone flounder, although marbled flounder tend to avoid low-salinity environments in the field. This study showed that extremely low-salinity environments, which reduce juvenile growth when consistently exposed, would not affect distribution or growth if they were temporary around low tide.
Keywords
stressors
flatfish
estuary
tidal flat
laboratory experiment
nursery ground
Descriptions
This work was partly supported by the Ministry of Agriculture, Forestry and Fisheries of Japan
Language
eng
Resource Type journal article
Publisher
Elsevier
Date of Issued 2024-07-05
Rights
© 2024. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
This is not the published version. Please cite only the published version.
この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。
Publish Type Accepted Manuscript
Access Rights embargoed access
Source Identifier
[DOI] https://doi.org/10.1016/j.ecss.2024.108872 isVersionOf
助成機関名
日本学術振興会
Japan Society for the Promotion of Science
助成機関識別子
[Crossref Funder] https://doi.org/10.13039/501100001691
研究課題名
沿岸性魚類の繁殖投資量に及ぼす水温と餌料環境の複合的影響の評価
沿岸性魚類の繁殖投資量に及ぼす水温と餌料環境の複合的影響の評価
研究課題番号
22H02421
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