Banana Fish - Pentapodus Emeryii

The Banana Fish (Pentapodus emeryii) is a slender, streamlined marine fish belonging to the threadfin bream family (Nemipteridae). Reaching an adult size of approximately 30 cm (12 inches), it is recognised by its silvery body accented with a vibrant yellow stripe running from the snout to the tail, giving rise to its common name.

In the wild, Banana Fish are commonly found in small schools over sandy bottoms, seagrass meadows, and reef slopes, where they actively forage for small invertebrates throughout the day.

Aquarium Requirements

Temperature: 24–28 °C (75–82 °F)

pH: 8.1–8.4

Specific Gravity (Salinity): 1.020–1.025

Alkalinity: 8–12 dKH

Ammonia & Nitrite: 0 ppm

Nitrate: <20 ppm

Aquascape and Environment:

Provide a spacious aquarium with plenty of open swimming areas combined with rockwork around the perimeter for shelter. A sandy substrate closely replicates its natural habitat and allows for natural foraging behaviour. Moderate to strong water movement and excellent oxygenation are beneficial, along with stable water parameters and high water quality.

Diet and Feeding

In the wild, the Banana Fish feeds primarily on small crustaceans, worms, molluscs, and other benthic invertebrates found within sandy substrates and seagrass habitats.

Recommended Foods:

• Frozen mysis shrimp
• Chopped shrimp, clam, squid, and other marine seafood
• High-quality marine carnivore pellets
• Enriched frozen plankton and krill
• Occasional live foods such as blackworms or enriched brine shrimp

Feed 2–3 times daily in moderate portions. A varied diet rich in marine proteins helps maintain vibrant colouration and overall health.

Temperament and Compatibility

The Banana Fish is a peaceful, active schooling species that mixes well with other non-aggressive marine fish. It is best kept in small groups where space allows, although single specimens also adapt well to large community aquariums.

Suitable Tankmates:

• Tangs
• Larger wrasses
• Rabbitfish
• Angelfish
• Peaceful groupers and snappers
• Larger gobies and squirrelfish

Avoid:

• Highly aggressive triggers
• Large predatory groupers capable of swallowing them
• Territorial fish that may harass active mid-water swimmers

Reef Compatibility

✅ Generally Reef Safe with Caution

The Banana Fish does not typically bother corals and is considered reef safe. However, it may consume very small ornamental crustaceans such as tiny shrimp or other delicate invertebrates. Larger ornamental shrimp, snails, and corals are generally left alone.

Additional Information

Maximum Size: 30 cm (12 inches)

Lifespan: 8–12 years with proper care

Difficulty Level: Easy to Moderate

Natural Behaviour: Active mid-water schooling fish that constantly forages over sandy bottoms

Origin: Indo-West Pacific, including the eastern Indian Ocean and western Pacific reefs

Colouration: Silver body with a bright yellow longitudinal stripe, yellow forked tail, and subtle blue iridescence around the head

Summary

The Banana Fish (Pentapodus emeryii) is an elegant and active marine species that adds constant movement and natural schooling behaviour to large marine aquariums. Its peaceful temperament, striking yellow markings, and relatively straightforward care make it an excellent choice for experienced fish-only or larger reef aquariums. Given ample swimming space, high water quality, and a varied carnivorous diet, this attractive threadfin bream can thrive for many years as a lively and eye-catching display fish.