Amblyeleotris yanoi Breeding Guide

Amblyeleotris yanoi is a Western Pacific shrimp goby of coastal sand flats that pairs with the red-banded shrimp Alpheus randalli. This guide covers its size dimorphism, the burrow setup and limited data on spawning and larval rearing.

Overview

Amblyeleotris yanoi Aonuma & Yoshino, 1996 is a reef-associated goby of the Western Pacific, ranging from the Ryukyu Islands to Papua New Guinea (FishBase). It lives on coastal sand flats, slopes and in deep lagoons at depths of about 3 to 35 m, associated with Alpheus randalli, the red-banded alpheid shrimp. Males reach about 13.0 cm standard length while females reach about 5.8 cm.

Sexing

Unlike most shrimp gobies, A. yanoi shows marked size dimorphism: males reach about 13.0 cm SL whereas females reach about 5.8 cm SL (FishBase), so the larger individual of a settled pair is typically the male. Beyond size, pairing behaviour remains the practical guide, with two compatible fish sharing one burrow treated as a pair.

Conditioning

Conditioning relies on stable reef parameters and frequent feeding. As a carnivore, the goby takes small meaty foods such as enriched mysis, brine shrimp and finely chopped marine items roughly twice daily. A securely paired Alpheus randalli lowers stress and keeps the fish feeding near the burrow entrance.

Breeding Setup

A breeding-oriented system reproduces the coastal sand-flat biotope with a deep, fairly fine sand bed and some rubble for tunnel support. Pairing with the red-banded shrimp Alpheus randalli is central: the shrimp excavates and maintains the burrow while the goby acts as a lookout, the shrimp keeping near-constant antenna contact with the fish (Amblyeleotris, Wikipedia).

Spawning Behavior & Trigger

Amblyeleotris gobies form monogamous pairs and lay demersal eggs inside the burrow, which the male guards until hatching (genus account). Species-specific clutch size and exact triggers for A. yanoi are not given in the cited references and are omitted; a stable, well-fed pair with a settled shrimp partner is the practical prerequisite.

Egg & Fry Care

The male tends the demersal eggs in the burrow until they hatch, after which the larvae are planktonic (genus account). Raising these planktonic larvae requires a separate rearing tank with appropriate very small first foods and stable conditions; a detailed protocol for A. yanoi is not published in the cited sources.

Common Challenges

Successful home breeding of Amblyeleotris is rare because the delicate eggs and small planktonic larvae demand specialised care. The larval phase is the bottleneck rather than pairing or settling, and a tight lid is advisable since shrimp gobies readily jump from open tanks.