lautnusantara.com Threadfin fish are a group of marine fish from the Polynemidae family, which are famous for having "long threads" (filaments) under their pectoral fins. This fish has high economic value and is often consumed in Southeast Asia, including Indonesia.
1. Characteristics of Threadfin Fish

• Threadfin fish are also known by the scientific name of various species in the Polynemidae family. One of the best known is Eleutheronema tetradactylum (Fourfinger threadfin).
• General characteristics:
• Long sensory threads (filaments) under the pectoral fins - this is the origin of the name "threadfin".
• Slender and elongated body.
• Silvery body color, sometimes slightly bluish or greenish.
• Deeply forked caudal fin (V-shaped).
• Size varies, some species can reach 1 meter in length.

2. Habitat

• Lives in shallow coastal waters, river mouths, and estuary areas.
• Likes muddy or sandy bottoms.
• Can be found in tropical waters of the Indo-Pacific, including Indonesia, India, and Australia.

3. Behavior

• Bottom feeder: uses filaments under the pectoral fins to detect prey such as small shrimp, worms, and other seabed organisms.
• Usually swims in small groups, especially when young.
• Some species have the habit of migrating between fresh water and the sea to lay eggs.
• Actively foraging in the morning and evening.

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