Fishes are divided into bony fishes and cartilaginous fishes, whose most prominent subspecies are the elasmobranches, which are starring famous species like ray or shark. Elasmobranches are quite ancient species which exhibit a slow growth rate combined with late maturity and low fecundity (biologists call that K-selected). This selection may be based on the predatory … Continue reading Why are sharks repelled by electropositive metals and magnets?