Ca mu, hay con goi la ca song, la ten goi chi chung ve cac loai ca cua bat ky mot so cac chi ca cua phan ho Epinephelinae thuoc ho Ca mu (Serranidae), trong Bo Ca vuoc (Perciformes).


Tong quan Tuy nhien khong phai tat ca cac loai ca trong ho Ca mu đeu đuoc goi la ca mu vi ho nay cung bao gom cac loai ca vuoc bien. Ten ca mu noi chung thuong đuoc đat cho nhung loai ca theo mot trong hai chi lon la Epinephelus va Mycteroperca. Ngoai ra, cac loai đuoc phan loai trong cac chi nho hon la Anyperodon, Cromileptes, Dermatolepis, Gracila, Saloptia, va Triso cung con đuoc goi la ca mu. Cac loai ca trong chi Plectropomus đuoc goi la ca mu bo bien (Plectropomus). Cac chi đeu đuoc xep vao phan ho Epiphelinae.
Tuy nhien, mot so loai trong chi Alphestes, Cephalopholis, Variola va mot so chi nho khac nhu Gonioplectrus, Niphon, Paranthias cung nam trong phan ho nay, va cac loai thuong xuyen khac trong chi ca mu khac cung co ten thong thuong lien quan đen tu "ca mu" (Grouper). Tuy nhien, tu "ca mu" ngay nay cua rieng no thuong đuoc dung duong nhu co nghia la thuoc ve phan ho Epinephelinae. Nhung con ca mu truong thanh co the dai toi 2,5 m va nang hon 300 kg.


Giao tiep Ca mu va ca hoi san ho (ca mu cham) co the đong hanh voi nhung loai duoi bien khac đe san moi. Ca mu thuong đi cung voi luon bien moray va ca bang chai Napoleon, cac loai ca nay co the am chi vi tri con moi bang cach dung đau huong ve đo, giup ban đong hanh cua chung phat hien con moi. Khi mot con ca chay tron khoi nhom san moi, ca mu di chuyen đen noi ma muc tieu đang an nap. Chung se xoay than cho đau ha thap xuong, sau đo lac đau toi-lui huong ve phia con moi đe ra hieu cho đong bon.
Ca mu đong hanh voi luon va ca wrasse Napoleon va su dung kha nang boi nhanh đe bat moi. Luon mora khong lo, loai co the truon vao nhung hoc nho, ket hop voi ca wrasse, loai co ham khoe nen co the nghien nat san ho đe con moi lo ra. Đieu nay gop phan cho thay, ngon ngu cu chi co the ton tai o cac loai khac chu khong gioi han o đong vat linh truong hay qua.


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