多点歧须鮠 · Cuckoo Synodontis

Overview

Endemic to Lake Tanganyika, Synodontis multipunctata combines shoaling behavior with an unusual reproductive strategy. Eggs placed among those of a spawning cichlid are collected by the host, and the young catfish consume the host's brood. Keep at least four together: an isolated fish is often much harder to observe.

Distribution & habitat

Lake Tanganyika is its natural range. Large aggregations occur in the lake.

Aquarium setup

Build secure rock shelters while retaining open swimming areas. Subdued light encourages visible activity. Plan the aquarium around a group rather than judging its space requirements from a single fish concealed in a cave.

Diet & feeding

The varied captive menu recommended for squeakers includes live, frozen, and dry foods, with shelled peas or cucumber available for scraping with the lower-jaw teeth. Young fish released by a host can take newly hatched brine shrimp before graduating to larger foods.

Behaviour & compatibility

Suitably sized hardwater cichlids are potential companions, especially mouthbrooders from the Rift Lakes. Exclude fish small enough to become prey. A group of four or more is preferable because solitary individuals tend to remain hidden.

Sexual dimorphism

Mature females are fuller-bodied, while males develop taller, more pointed dorsal fins. Genital papillae provide another distinction: the male structure is elongated and ridged, the female's rounder. Handling for examination requires experience around sharp fin spines.

Breeding

Captive breeding is well represented in the account. A separate breeding aquarium can contain rock caves or clay pots, arranged simply enough to allow adults to be removed. Small mouthbrooding cichlids from Lakes Malawi or Victoria are commonly selected as hosts. Condition both groups with live and frozen foods and maintain clean water with low nitrate.

The catfish monitor cichlid courtship and enter the spawning site to release eggs and sperm, often consuming some host eggs during these incursions. Once the female cichlid has gathered the eggs, remove the adult catfish. Their eggs generally hatch after about three days, ahead of the host's brood. The larvae initially eat cichlid eggs and early-hatching young. Remove the host after it releases the catfish fry, then feed newly hatched brine shrimp.

Spawnings without a host have also occurred in aquaria, although less often. Similar independent reproduction in the wild remains a possibility rather than an established frequency.

Notes

The mouthbrooding parent is the host cichlid, not the catfish. Some Tanganyikan hosts may have developed avoidance responses through coexistence with this brood parasite; this is one proposed explanation for the use of hosts from the other two lakes.