Eviota guttata Breeding Guide

Eviota guttata is a tiny Indo-Pacific dwarfgoby whose reproduction is poorly documented and not reported from home aquaria. This guide covers what is known of its biology and the obstacles to captive breeding.

Overview

Eviota guttata, the spotted dwarfgoby, is one of the smallest reef fishes, reaching a total length of about 3.2 cm. It is described from Massawa, Eritrea, and occurs in the western Indian Ocean including the Red Sea, Gulf of Aqaba, Gulf of Oman, Maldives and Seychelles, on shallow inshore reefs with mixed coral and algal growth at depths under 15 m. Members of the genus Eviota are short-lived, with some tropical species completing their life cycle in as little as 3.5 weeks.

Sexing

Published sources do not document reliable external sexing characters specific to Eviota guttata. Across the genus, sexes are difficult to separate visually outside the spawning period, when males may be observed tending eggs. No verified field guide to in-aquarium sexing of this species is available.

Breeding Setup

No captive-breeding protocol has been published for Eviota guttata. Its natural habitat is shallow coral-and-algal reef, which suggests a mature, stable nano reef system would be required to keep the species at all. Given its extremely small adult size and very short natural life cycle, any attempt at reproduction would need a heavily fed copepod- and rotifer-rich system rather than a documented method.

Common Challenges

The principal challenge is the near-total absence of documented reproductive data. The species' tiny size, brief lifespan and the demersal egg-laying habit typical of small gobies — eggs deposited in crevices and on hard substrate — make egg detection and larval rearing of any resulting fry experimentally difficult. Larvae of small reef gobies typically require very small live prey, which has not been worked out for this species.