Breeding Elacatinus multifasciatus (Greenbanded Goby)
Elacatinus multifasciatus, the greenbanded goby, is a tiny Caribbean benthic spawner and protogynous hermaphrodite. Pairs spawn in sheltered crevices and the larvae can be reared, making it a popular captive-bred nano fish.
Overview
The greenbanded goby of this profile (KB scientific name Elacatinus multifasciatus) is listed in FishBase under the currently accepted name Tigrigobius multifasciatus (Steindachner, 1876). It is a small Western Atlantic goby from the Bahamas and Central America to northern South America, reaching 5.0 cm TL, typically found on pitted limestone faces and tide pools and often among the spines of rock-boring sea urchins. It is a popular captive-bred nano species.
Sexing
FishBase records this goby as a protogynous hermaphrodite that is monandric, meaning each group contains only one male. Sex reversal from female to male is completed in 3-5 weeks, with the length at sex change reported around 2.0 cm TL. In practice a group raised together produces a dominant male and a functional female, forming the spawning unit.
Conditioning
This is a micro-predator that takes small meaty foods; an estimated trophic level of about 3.2 reflects a diet of tiny invertebrates. Conditioning relies on frequent small feedings in a stable nano reef, with rockwork or urchin-spine cover that mirrors the natural microhabitat and gives the pair secure spawning recesses.
Breeding Setup
A nano reef with abundant small crevices suits this species. Knowledge-base parameters are temperature 24-26 degrees C, pH 8.1-8.4 and moderate flow. Small shells or holes in rock serve as spawning sites, matching the limestone and urchin-spine refuges the species uses in the wild.
Spawning Behavior & Trigger
Elacatinus multifasciatus is a benthic (demersal) spawner: the pair attaches adhesive eggs inside a protected recess. As with related Elacatinus cleaner gobies, a settled, well-conditioned pair in a stable system spawns readily, without a documented external trigger beyond good condition and shelter.
Egg & Fry Care
The eggs are guarded at the demersal nest site until hatching, after which the larvae are planktonic. The species is among the smaller marine gobies bred in captivity; larvae are reared on very small first foods such as rotifers before moving to Artemia nauplii, with settlement following the planktonic phase. Small larval size makes first feeding the critical step.
Common Challenges
- Providing first foods small enough for the very small larvae at hatching.
- Managing the single-male social structure so only one male holds the group.
- Maintaining stable water quality in the small volumes used for nano larval rearing.