Groupers - Olwandle - Iningizimu AfrikaGrouper, RockcodEjwayelekile ingamasentimitha angama-40 ubude, kodwa ingakhula ize ibe ngamamitha amabili.Lena yinhlanzi eqinile enomzimba obacakile nomlomo omkhulu. Ivame ukuba nomsila othanda ukuba yindilinga – ngaphandle kwe-Lyretail Rockcod. Ama-fin okugwedla asesifubeni nawo athanda ukuba yindilinga. Imibala yale nhlanzi iyashiyana kusukela konsundu onamabala amhlophe kuya kobomvu ngokugqamile.Umndeni wezinhlanzi owaziwa nge-Epinephelinae unemikhakha engama-31 nezinhlobo ezingama-99. Ama-Rockcod yizinhlanzi ezinkulu (zingafika kumakhilogremu ayi-179) futhi zijwayele ukubonakala ezindaweni ezinamatshe noma isihlabathi esiphakeme olwandle. Le nhlanzi uyatholakala nasezindaweni ezinamadwala aphakeme ogwini lapho amagagasi eshaya khona abuyele emuva.Uhlobo lwale nhlanzi olwaziwa nge-Potato Bass kalubexwayi abatshuzi uma lubabona. Uma idla igwinya konke ukudla bese ikufahlaza ngemihlathi yayo eqinile. I-Rockcod iyakwazi ukushintsha ubulili, isuka esifazaneni iya esiliseni. Le nhlanzi uma izalela amaqanda iyawasaphaza nomaphi olwandle, ayiwabeki ezidlekeni.Idla ezinye izinhlanzi, izingwane, izinkalankala nama-lobster.
