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Johnius spp., commonly known as Gelama or Croakers, are a diverse genus of marine and brackish water fish belonging to the family Sciaenidae. They are characterized by their elongated, moderately compressed bodies, often with a silvery or brownish coloration. Many species possess a distinctive sonic muscle and swim bladder structure that allows them to produce drumming or croaking sounds, particularly during spawning. They are demersal fish, typically found over soft bottoms in coastal waters, estuaries, and sometimes in freshwater reaches.
Ciri-ciri Fizikal
- Bentuk badan
- elongated
- Warna
- Generally silvery to brownish or grayish dorsally, often lighter ventrally. Some species may have faint vertical bars or spots. Fins are typically dusky or yellowish.
- Jenis sisik
- ctenoid
- Kedudukan mulut
- terminal
- Ciri tersendiri
- Presence of a sonic muscle and swim bladder capable of producing sounds., Two dorsal fins, deeply notched or separated., A prominent lateral line that extends to the caudal fin., Often possess small barbels or pores on the chin (though not as pronounced as in some other sciaenids).
- Sirip dorsal
- Two dorsal fins; the first is spiny (8-11 spines), and the second is long with one spine and numerous soft rays (26-30). The two fins are often deeply notched or distinctly separated.
- Sirip ekor
- Caudal fin typically rhomboidal or truncate, sometimes slightly pointed.
- Sirip pektoral
- Pectoral fins are moderately long, usually reaching to or beyond the tip of the pelvic fins.
- Sirip tersendiri
- Pelvic fins are thoracic, located below the pectoral fins, with one spine and five soft rays. Anal fin has two spines (the second often robust) and 7-9 soft rays.
Petua Pengenalan
Body Shape and Coloration
Look for an elongated, moderately compressed body, typically silvery-grey to brownish. Note any faint patterns like bars or spots.
Dorsal Fins
Observe the two dorsal fins; the first is spiny and the second is long and soft-rayed. The degree of separation or notch between them is a key characteristic.
Lateral Line
The lateral line is prominent and extends all the way to the caudal fin, often with a slight curve.
Mouth and Chin
The mouth is terminal. Check for the presence and size of any pores or small barbels on the chin, which can vary between species.
Sound Production
If handled or observed in their natural environment, listen for drumming or croaking sounds, a hallmark of the Sciaenidae family.
Habitat
- Jenis air
- saltwater
- Kedalaman
- Typically found in shallow coastal waters, estuaries, and sometimes freshwater, ranging from the surface to depths of about 100 meters.
- Persekitaran
- Demersal, inhabiting soft bottoms (mud, sand) in coastal areas, estuaries, and sometimes river mouths. They are often associated with turbid waters.
- Julat geografi
- Indo-West Pacific, including the Indian Ocean, Southeast Asia, and parts of the Western Pacific. Specific distribution varies greatly by individual species within the genus.
Maklumat Akuarium
- Tahap penjagaan: expert
- Perangai: semi-aggressive
- Diet: carnivore
- Saiz tangki minimum: 200 gallons (for larger species, smaller for juveniles of smaller species)
- Suhu: 24-28°C (75-82°F)
- Tahap pH: 7.8-8.4
- Kekerasan air: 1.020-1.025 SG
- Keserasian: Generally not suitable for typical home aquariums due to size and specialized care. Can be kept with other large, robust, non-aggressive marine fish in very large, species-specific or public aquaria.
- Keperluan khas: Requires a large tank with ample swimming space and a soft substrate (sand) for burrowing or resting. Excellent filtration is essential due to their carnivorous diet. Live or frozen meaty foods are preferred. Not commonly kept in home aquaria.
Maklumat Liar
- Status pemuliharaan: least concern
- Musim: Spawning seasons vary by species and geographic location, but generally occur during warmer months. Available year-round in many regions due to widespread distribution.
- Harga pasaran: Varies significantly by species, region, and size, generally moderate to high.
- Kepentingan komersial: high
- Rasa: Mild, slightly sweet, often described as having a clean flavor.
- Tekstur: Flaky, firm white flesh.
- Kaedah memasak: frying, steaming, grilling, baking, curries
- Nilai pemakanan: Good source of lean protein, omega-3 fatty acids, and various vitamins and minerals.
Fakta utama
Sound Productionbehavior
Gelama (Johnius spp.) are well-known for their ability to produce drumming or croaking sounds using specialized sonic muscles attached to their swim bladder. These sounds are primarily used for communication, especially during courtship and spawning.
Habitat Versatilityinteresting
While primarily marine, many Johnius species are euryhaline, meaning they can tolerate a wide range of salinities and are frequently found in brackish estuaries and even freshwater sections of rivers, showcasing remarkable adaptability.
Commercial Importanceinteresting
Gelama species are highly valued in commercial fisheries throughout the Indo-West Pacific, forming a significant component of local catches and providing an important food source for coastal communities.
Dietary Habitsbehavior
These fish are opportunistic carnivores, primarily feeding on small crustaceans (like prawns and crabs), polychaete worms, and small fish, reflecting their demersal lifestyle.
Maklumat keselamatan
Selamat- Tahap keselamatan: safe
- Berbisa: Tidak
- Kebolehmakanan: edible
- Nota pengendalian: No specific handling precautions beyond standard fish handling. Spines on the dorsal and anal fins can be sharp, so handle with care to avoid punctures. No known venomous properties.
Spesies serupa
Blackmouth Croaker
Atrobucca nibe
Generally darker mouth lining, often with a more pointed snout and different swim bladder morphology. Johnius spp. typically have a lighter mouth.
Silver Croaker
Pennahia argentata
Often has a more silvery appearance and a different number of soft rays in the dorsal and anal fins. Swim bladder morphology also differs.
Other Sciaenid Genera
Various
Distinguished by specific counts of fin rays, scale patterns, presence/absence and morphology of chin barbels, and internal swim bladder structure (which often requires dissection for definitive identification).
Klasifikasi saintifik
- Kerajaan
- Animalia
- Filum
- Chordata
- Kelas
- Actinopterygii
- Ordo
- Perciformes
- Keluarga
- Sciaenidae
- Genus
- Johnius
- Spesies
- spp.
Terokai Gelama
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