Longnose Butterflyfish (Forcipiger flavissimus) Breeding Guide

Breeding the longnose butterflyfish (Forcipiger flavissimus): a monogamous pelagic-spawning reef fish with planktonic larvae that is not bred in home aquariums.

Overview

Forcipiger flavissimus is a butterflyfish (family Chaetodontidae) widespread across the Indo-Pacific from East Africa and the Red Sea to the Hawaiian and Easter islands and into the eastern Pacific, reaching about 22 cm (FishBase, Wikipedia). It is oviparous and forms monogamous breeding pairs, with documented pair fidelity of seven or more years (FishBase, Wikipedia). It lays pelagic, freely floating eggs, and as a butterflyfish it is not bred in home aquariums.

Sexing

External sexual dimorphism is not documented; pairs form during breeding, with females defending food resources from other females and males defending territories containing females (Wikipedia). Reliable visual sexing is not described.

Spawning Behavior & Trigger

The species forms monogamous pairs and lays pelagic, freely floating eggs that drift in the plankton (Wikipedia). Butterflyfish are pelagic spawners that release many buoyant eggs into the water column to float with the currents until hatching (Wikipedia). This open-water egg release cannot be reproduced or captured in an aquarium.

Egg & Fry Care

Butterflyfish larvae pass through the tholichthys stage, in which the post-larval body is covered in large bony plates that are shed as the fish matures (Wikipedia). The long planktonic larval period and minute first-stage larvae make these fish among the most difficult marine species to rear, and no home protocol exists for this species.

Common Challenges

Broadcast pelagic eggs, a prolonged drifting larval period, and the tholichthys stage put breeding Forcipiger flavissimus beyond home aquaria. A bonded pair can be maintained, but reproduction to settlement is not achievable at home.