The cd "Folk Guyana Style may be downloaded at a couple of sites.

Lyr. Add: KUMA-KUMA FISH

No eat ah fish, mama !
Na eat ah fish !
Ah kuma-kuma fish, mama
Nah eat ah fish !

He worse than perai, mama
Worse than perai.
Ah Kuma-Kuma fish, mama,
Nah eat ah fish !

He guh bring you bad luck, mama
Bring you bad luck.
Ah kuma-Kuma fish, mama
Nah eat ah fish !

He guh wok you belly, mama
Wok you belly.
Ah Kuma-Kuma fish, mama
Nah eat ah fish !

http://voiceofguyana.com/2005/07/12/kuma-kuma-fish

The kuma-kuma is a bottom dweller; depending on species, from marine to brackish to freshwater. It has long filaments extending from the head.
Perai is a Tamil word, used for some flat fish. Couldn't find the specific fish indicated in the song.