The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberingsea00hood Year: 1981 Fish diseases 923 78° 176° 174° 172° 170° 16B° 166° 164° 162° 160° 158° 156° 154° 59' 58°-- 57°- 56' 55' 54' 53' 52' 180° 178° Figure 55-6 176° 174° 172° 170° 168° 166° 164 162° 160° 158° 156° The general distribution and frequencies of pollock with pseudobranchial tumors in the Bering Sea. Skin lesions of Pacific cod Two main types of skin lesions were observed on Pacific cod: ulcers (Fig. 55-7) and ring-shaped lesions (Fig. 55-8) (McCain et al. 1979)

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The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder . easternberingsea00hood Year: 1981 Fish diseases 923 78° 176° 174° 172° 170° 16B° 166° 164° 162° 160° 158° 156° 154° 59' 58°-- 57°- 56' 55' 54' 53' 52' 180° 178° Figure 55-6 176° 174° 172° 170° 168° 166° 164 162° 160° 158° 156° The general distribution and frequencies of pollock with pseudobranchial tumors in the Bering Sea. Skin lesions of Pacific cod Two main types of skin lesions were observed on Pacific cod: ulcers (Fig. 55-7) and ring-shaped lesions (Fig. 55-8) (McCain et al. 1979). The ulcers were roughly circular, ranged from approximately 1 to 50 mm in diameter, and were either pale white or red (hemorrhagic), with a dark pigment concentrated in the margin of the surrounding epidermis. Each affected fish had between 1 and 40 ulcers. The ring-shaped lesions were chairacterized by a cream- colored strip 5-20 mm wide, sometimes with hemor- rhagic foci surrounding a normal-appearing circular

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