Yasha Goby Breeding Guide

Stonogobiops yasha has been captive bred: conditioned pairs spawn in synthetic caves, and larvae settle and metamorphose 35-50 days post hatch.

Overview

Stonogobiops yasha is a small shrimp goby that has been successfully captive bred. The first metamorphosed juveniles were produced by Rising Tide Conservation, with work at Roger Williams University led by Joe Szczebak, Brad Bourque, and Dr. Andy Rhyne. In their first attempt, six of nine conditioned pairs spawned regularly and 38 thriving juveniles were raised.

Sexing

The species lives and breeds in male-female pairs, and pairs were established for the breeding program, so obtaining a compatible pair is the practical starting point. The species forms a symbiotic relationship with the pistol shrimp Alpheus randalli, in which the shrimp maintains the shared burrow while the goby acts as lookout.

Breeding Setup

In the breeding program, pairs laid their nests within synthetic caves. The role of the symbiotic A. randalli pistol shrimp in reproduction was specifically observed, so providing the shrimp partner and a defined burrow or cave structure reflects the documented setup. A range of environmental conditions was tested to best induce spawning.

Spawning Behavior & Trigger

Once conditioned, pairs spawned regularly, laying nests inside their synthetic caves. Six of the nine conditioned pairs in the program were regularly spawning, indicating that stable, well-conditioned pairs reproduce readily under the right environmental cues.

Egg & Fry Care

Larvae successfully settled and metamorphosed around 30-50 days post hatch; the first metamorphosed juveniles settled out at 35 to 50 days post hatch. This relatively long pelagic larval period must be maintained through to settlement, after which juveniles can be grown on.

Common Challenges

Despite years of attempts, breeding this species remained elusive until the Rising Tide work, underscoring that the multi-week larval period is the principal difficulty. Sustaining tiny larvae through 30-50 days before settlement requires careful conditions, which is why captive-bred specimens are valued as wild supply is limited.