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Fig. 21.1 Histological section of mantle tissue of Mytilus galloprovincialis with neoplasias.
Males: (a) Loss of follicular structure (10); (b) Multinucleated and hyperchromatic cells (100);
(c) Karyorrhexis and karyolisis (arrows; 100); (d) Breach of follicular membrane and infiltration
of tumour cells by connective tissue and vessels. Fibrosis (arrows) (20); (e) Proliferation of
haemocytes around the affected follicles (20). Females: (f) Loss of follicular structure (10);
(g) Hyperplasia and hyperchromatic cells (100); (h) Vacuolizated cytoplasm (arrows; 40);
(i) Fibrosis (arrows) and karyrrhesis (asterisk) (60); (j) Altered haemocytes (arrows; 40)