Early Development of Squamation in Relation to Color Anomalies in Hatchery-reared Flounder, Paralichthys olivaceus

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Color anomalies occur frequently in hatchery-reared young of the flouder Paralichthys olivaceus.The anomalies usually accompany aberrations in other external characters as described for natural populations of flatfishes. In normally colored individuals, the squamation on the ocular side started along the posteror half of the lateral line at 20.2 mm in total length and was complete at 54.0 mm.Squamation in individuals with anomalous coloration started on both ocular and blind sides at 22.1 mm in TL, and was completed at 51.8 mm.Though squamation started at the same part of the body in both normal and anomalous fish, development of squamation on both sides was more rapid in normal individuals than in anomalous ones.In normal fish greater than 50 mm in TL, scales were larger and had more spines and ridges than in anomalously colored individuals.
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