Denticle Herring

Geographic Origin and Biotope: Endemic to a tiny range in coastal rivers of southwestern Nigeria and Benin. Slow forest streams with sandy bottoms in soft, acidic, tannin-rich water under the Guinean rainforest canopy. Extremely rare; habitat severely threatened.

Taxonomy and Morphology: The sole living representative of Denticipitidae, a monotypic taxon linking herrings to primitive bony fish. Unique dermal denticles on the skull exist in no other living fish. Small (max 4-5 cm), elongated, silver, compressed body.

Social Behavior: Obligate nervous schooler. Needs 10-15+. Alone or in small groups, it panics and slams into glass repeatedly, injuring itself fatally.

Coloration and Sexual Dimorphism: Uniform silver with steel-blue dorsal reflections. Its beauty lies in its taxonomic extraordinariness, not its livery.

Tank Setup: 100+ liters (80+ cm) with ample free swimming space. Moderate constant current. Plants only at edges. Sealed lid: jumps extremely easily.

Feeding: Planktivorous micro-predator. Accepts artemia nauplii, cyclops, daphnia, and fine granules in suspension. Does not feed from the bottom.

Water Quality: Soft (GH 2-8), acidic (pH 5.5-7.0), 24-27°C. Extremely sensitive: ammonia spikes cause immediate mortality. Perfectly cycled and stable tank required.

Compatibility: Only with tiny, peaceful soft-water fish: micro Tetras, Boraras, Nannostomus. Any aggressive or noisy fish terrorizes it.

Reproduction: Practically unknown in captivity.

Risks: Stress is the absolute killer. These fish literally die of fright from loud noises, vibrations, frequent handling, or sudden light. Tank must be in a quiet location away from slamming doors and speakers.