In which of the following fishes are young ones fed on the mucus of the parent?

Correct option is A

→ Discus fish parents produce nutrient-rich mucus on their skin, which fry feed on after hatching.
→ This unique parental care ensures high survival during early growth stages.
→ Both parents take turns providing mucus by rotating between broods.
Information Booster:
→ Mucus contains proteins, immune factors, and lipids essential for fry development.
→ This behaviour continues for 1–2 weeks until juveniles start free feeding.
→ Discus are among the few aquarium fishes showing advanced parental care.
Additional Information (Other Options):
(b) Flowerhorn: Egg layers, guard eggs but no mucus feeding.
(c) Oscar: Provide parental care but no mucus feeding.
(d) Medaka: Egg-carrying species; no parental mucus feeding.