GROSS SIGNS OF TUMORS IN GREAT LAKES FISH:
A MANUAL FOR FIELD BIOLOGISTS

Figure 4. Melanomas on brown bullhead. (A) Large flat black melanoma on a bullhead. Note also the clubbed ventral barbels. (B) Raised melanoma on the top of the head of a brown bullhead. (Fig. 4A Courtesy of M. Mueller).

  Figure 4a

  Figure 4b

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