Callorhinchus callorynchus

Callorhinchus callorynchus, the elephantfish or cockfish, is a species of fish in the Callorhinchidae family found in Peru, Chile, Argentina, Uruguay, and southern Brazil. Its natural habitat is open seas.

Being a holocephalan from the south-western region of the atlantic, the cockfish (Callorhinchus callorynchus) is a vital resource for fisheries in Argentina. A study was conducted on the reproductive biology of the cockfish by Melisa A. Chierichetti from UNMDP which found that there was a presence of sexual dimorphism, where the females were larger and heavier than the males of that population (Chierichetti 7)[2]. Another aspect of this study had discovered that the relative fecundity rate of the population of cockfish (Callorhinchus callorynchus) was significantly low because the females were in the resting stage of their reproductive cycle. Also, the males in the population weren't mature, thus the population was found to not be highly reproductive (6)[3]. This information was helpful in implementing methods for conservation and reduced over-fishing (2)[4].