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Terapon jarbua, commonly known as the Jarbua Terapon or Gerut-gerut, is a highly adaptable and widespread species of grunter belonging to the family Terapontidae. It is characterized by its distinctive striped pattern and the presence of sharp opercular spines. This species is euryhaline, thriving in a wide range of salinities from freshwater to hypersaline conditions, and is often found in coastal waters, estuaries, and even penetrating far upstream into rivers. It is an opportunistic predator and a significant component of many coastal ecosystems.
Ciri Fisik
- Bentuk tubuh
- compressed
- Warna
- Silvery-grey to whitish body with three to four prominent, curved, dark brown to black longitudinal stripes on the upper half of the body. A distinct dark blotch is often present on the operculum. Fins are typically translucent with dusky margins, and the caudal fin often has dark spots or bands.
- Jenis sisik
- ctenoid
- Posisi mulut
- terminal
- Ciri khas
- Three to four distinct, curved, longitudinal dark stripes on the upper body., A prominent dark blotch on the operculum., Two strong spines on the operculum, the lower one being longer and stronger., Serrated preoperculum., A deeply notched dorsal fin.
- Sirip punggung
- Single, deeply notched dorsal fin with 11-12 spines and 9-11 soft rays. The spinous portion is longer than the soft-rayed portion.
- Sirip ekor
- Slightly forked caudal fin with rounded lobes.
- Sirip dada
- Moderately sized, rounded pectoral fins.
- Sirip khas
- Anal fin with 3 spines and 8-10 soft rays. Pelvic fins are thoracic with 1 spine and 5 soft rays.
Tips Identifikasi
Body Stripes
Look for the characteristic three to four curved, dark longitudinal stripes on the upper half of the body. These stripes are a key identifier.
Opercular Spines
Observe the two strong spines on the operculum (gill cover), especially the lower one which is notably longer and sharper. Exercise caution when handling due to these spines.
Dorsal Fin Notch
Note the deep notch in the dorsal fin, separating the spiny and soft-rayed portions.
Size and Shape
Adults typically reach up to 30-36 cm (12-14 inches) in total length, with a compressed, moderately deep body.
Habitat
- Jenis air
- brackish
- Kedalaman
- Typically found in shallow waters, from surface to about 20 meters (65 feet).
- Lingkungan
- Highly euryhaline, inhabiting coastal marine waters, estuaries, mangrove swamps, tidal creeks, and the lower reaches of freshwater rivers. Prefers areas with sandy or muddy bottoms, often near seagrass beds or rocky structures. Juveniles are frequently found in very shallow, turbid estuarine environments.
- Sebaran geografis
- Indo-West Pacific: Red Sea and East Africa to Samoa, north to southern Japan, south to northern Australia. Also found in the Mediterranean Sea via the Suez Canal (Lessepsian migrant).
Informasi Akuarium
- Tingkat perawatan: intermediate
- Temperamen: semi-aggressive
- Pola makan: carnivore
- Ukuran akuarium minimum: 150 gallons (570 liters) for adults
- Suhu: 22-28°C (72-82°F)
- Tingkat pH: 7.0-8.5
- Kesadahan: 10-25 dGH
- Kompatibilitas: Best kept in a species-specific tank or with other large, robust, and semi-aggressive brackish or marine fish. Avoid keeping with smaller or docile species as they may be preyed upon.
- Kebutuhan khusus: Requires a large tank with ample swimming space and hiding spots. Filtration must be robust due to their predatory nature and waste production. Can be kept in freshwater as juveniles but requires brackish to marine conditions as they mature. Substrate should be sand or fine gravel. Provide good water circulation.
Informasi di Alam Liar
- Status konservasi: least concern
- Musim: Present year-round in its range, with no distinct seasonal migrations for spawning or feeding, though local abundances may fluctuate with environmental conditions.
- Harga pasar: Low to moderate, depending on region and size.
- Nilai ekonomis: medium
- Rasa: Mild, slightly sweet
- Tekstur: Firm, flaky white flesh
- Metode memasak: Frying, Grilling, Steaming, Curry
- Nilai gizi: Good source of protein and omega-3 fatty acids.
Fakta kunci
Euryhaline Championamazing
Terapon jarbua is remarkably euryhaline, capable of tolerating a wide range of salinities from pure freshwater to hypersaline conditions, making it a true survivor in diverse aquatic environments.
Venomous Spinesinteresting
The opercular and dorsal fin spines of the Jarbua Terapon are venomous, providing a defense mechanism against predators and requiring careful handling by humans.
Opportunistic Predatorbehavior
This species is an opportunistic predator, feeding on a variety of small fish, crustaceans, and insects, adapting its diet to the available prey in its diverse habitats.
Lessepsian Migrantevolution
Terapon jarbua is one of the successful Lessepsian migrants, having colonized the Mediterranean Sea from the Red Sea via the Suez Canal, demonstrating its adaptability and dispersal capabilities.
Informasi keamanan
Tangani dengan hati-hati- Tingkat keamanan: caution
- Berbisa: Ya
- Kelayakan konsumsi: edible
- Catatan penanganan: The opercular spines and dorsal fin spines of Terapon jarbua are venomous and can inflict painful stings. Exercise extreme caution when handling this fish. If stung, clean the wound thoroughly and apply heat (e.g., hot water immersion) to denature the protein-based venom. Seek medical attention if symptoms are severe or persistent.
Spesies serupa
Largescale Terapon
Terapon theraps
Terapon theraps has straighter, less curved longitudinal stripes and generally larger scales. The opercular spines may also differ slightly in prominence and shape.
Small-spotted Terapon
Terapon puta
Terapon puta typically has more numerous, thinner, and often broken longitudinal stripes, and a more elongated body shape. The caudal fin often has distinct spots or bands.
Four-lined Terapon
Pelates quadrilineatus
Pelates quadrilineatus has four distinct, straight, dark longitudinal stripes and a smaller maximum size. Its body is generally more slender than T. jarbua.
Klasifikasi ilmiah
- Kerajaan
- Animalia
- Filum
- Chordata
- Kelas
- Actinopterygii
- Ordo
- Perciformes
- Famili
- Terapontidae
- Genus
- Terapon
- Spesies
- Terapon jarbua
Jelajahi Jarbua Terapon
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