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Daily growth patterns in otoliths of larval and juvenile plaice (Pleuronectes platessa L.): influence of temperature, salinity, and light conditions
Karakiri, M.; von Westernhagen, H. (1989). Daily growth patterns in otoliths of larval and juvenile plaice (Pleuronectes platessa L.): influence of temperature, salinity, and light conditions. Rapp. et Proc.-Verb. Cons. Int. Explor. Mer 191: 376-382
In: Rapports et Procès-Verbaux des Réunions du Conseil Permanent International pour l'Exploration de la Mer. Conseil Permanent International pour l'Exploration de la Mer: Copenhague. ISSN 0074-4336, meer
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  • Karakiri, M.
  • von Westernhagen, H., meer
Abstract
    Daily growth increments were studied in otoliths of larval and juvenile plaice reared in the laboratory. The influence of temperature, salinity, and light cycle on increment deposition was investigated. Otolith growth was related to somatic plaice growth under all environmental conditions examined. Various constant temperature and salinity conditions influenced somatic growth rate and increment widths in otoliths. At 10°C, wide clear increments were deposited in the otoliths. At 5°C, slow growth rates were observed associated with deposition of narrow otolith increments. Low salinity (20 ppt) negatively affected somatic and otolith growth of larvae when combined with low temperature. Low salinity when combined with optimal temperature negatively affected otolith increment width of juveniles. Abrupt changes in the rearing conditions also invoked a direct response of increment widths in otoliths. Temperature increase led to growth acceleration and deposition of wide increments in the otoliths. On the other hand, temperature and salinity decrease led respectively to growth retardation and narrow increment deposition. Light cycle had a less pronounced effect on the increment width.
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