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Macquaria colonorum, commonly known as the Estuary Perch, is a highly regarded Australian native fish belonging to the family Percichthyidae. It is a predatory species known for its robust build and adaptability to a wide range of salinities, from freshwater rivers to estuarine environments. This species is highly prized by recreational anglers due to its fighting qualities and elusive nature. Estuary Perch are an important component of the estuarine food web, preying on smaller fish and crustaceans.
Physical Characteristics
- Body shape
- compressed
- Coloration
- Generally dark olive-green to bronze on the back, fading to silvery-white on the belly. Fins are typically dusky. Some individuals may exhibit a golden sheen, particularly in clear water.
- Scale type
- ctenoid
- Mouth position
- terminal
- Distinctive features
- Deep, compressed body, Large, dark eyes, Concave dorsal profile of the head, Two distinct dorsal fins (spiny and soft-rayed) that are almost continuous, Large, ctenoid scales, Slightly protruding lower jaw
- Dorsal fin
- Two dorsal fins, almost continuous. The first dorsal fin has 7-10 strong spines, and the second has 1 spine and 8-11 soft rays.
- Tail fin
- Moderately forked caudal fin.
- Pectoral fin
- Pectoral fins are relatively small and rounded.
- Distinctive fins
- Anal fin has 3 strong spines and 7-9 soft rays. Pelvic fins are thoracic.
Identification Tips
Body Shape
Look for a deep, compressed body, distinct from the more elongated shape of Australian Bass.
Head Profile
The dorsal profile of the head is typically concave, especially above the eyes.
Dorsal Fins
Two dorsal fins are present, almost joined, with the spiny anterior dorsal fin being prominent.
Coloration
Dark olive to bronze back, silvery flanks, and a white belly. Can be darker in tannin-stained waters.
Habitat
- Water type
- brackish
- Depth
- Typically found in shallow to moderate depths, often associated with structure.
- Environment
- Primarily estuarine, inhabiting coastal rivers, estuaries, and their lower freshwater reaches. They prefer areas with submerged timber, rock bars, weed beds, and other forms of cover. They can tolerate a wide range of salinities, from freshwater to full marine conditions, but are most commonly found in brackish water.
- Geographic range
- Southeastern Australia, from the Richmond River in northern New South Wales, south through Victoria, and into eastern South Australia (e.g., Lower Lakes of the Murray River system).
Aquarium Information
- Care level: advanced
- Temperament: semi-aggressive
- Diet: carnivore
- Minimum tank size: 500L
- Temperature: 18-26°C
- pH level: 6.5-8.0
- Hardness: 5-20 dGH
- Compatibility: Best kept in a species-specific tank or with other large, robust native fish. Avoid small or delicate tank mates.
- Special requirements: Requires excellent filtration, stable water parameters, and plenty of hiding spots (e.g., driftwood, rocks). Can be sensitive to sudden changes in water quality. Juveniles can be kept in freshwater, but adults may benefit from brackish conditions for optimal health and breeding readiness.
Wild Information
- Conservation status: least concern
- Seasonality: Spawning migrations typically occur in late autumn to early winter (April-July) when adults move downstream to brackish or saline waters to breed. They are often targeted by anglers during these periods, though regulations apply.
- Market price: Not typically sold commercially for consumption; primarily a recreational fishing target.
- Commercial importance: low
- Taste: Mild, sweet, and clean
- Texture: Firm, white, flaky flesh
- Cooking methods: Pan-fried, Baked, Grilled, Steamed
- Nutritional value: Good source of protein and Omega-3 fatty acids.
Key Facts
Migratory Spawnersbehavior
Estuary Perch undertake significant downstream migrations to brackish or saline waters to spawn during late autumn and winter, a behavior known as catadromy.
Salinity Tolerantamazing
They are highly euryhaline, meaning they can tolerate a wide range of salinities, from pure freshwater to full marine conditions, which is crucial for their life cycle.
Angler's Delightinteresting
Highly sought after by recreational anglers for their strong fighting ability and challenging nature, often requiring specific techniques and knowledge of their habits.
Habitat Generalistsbehavior
While preferring structure, they can be found in diverse estuarine habitats, from deep holes to shallow snags and weed beds.
Safety Information
Safe- Safety level: safe
- Venomous: No
- Edibility: edible
- Handling notes: Estuary Perch have sharp spines on their dorsal and anal fins. Handle with care to avoid painful punctures. Use a wet cloth or glove to hold them, and support their body weight, especially if releasing. They are a robust fish but should be returned to the water quickly if caught and released.
Similar Species
Australian Bass
Macquaria novemaculeata
Australian Bass have a more elongated body shape, a straighter dorsal head profile, and typically a more pronounced notch between the spiny and soft dorsal fins. Their eyes are also generally smaller relative to their head size compared to Estuary Perch. Australian Bass are predominantly freshwater, while Estuary Perch are estuarine and coastal river dwellers.
Golden Perch
Macquaria ambigua
Golden Perch have a more rounded body profile, a distinct hump on the back, and a golden-yellow coloration. They are exclusively freshwater and found further inland in the Murray-Darling Basin.
Scientific Classification
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Actinopterygii
- Order
- Perciformes
- Family
- Percichthyidae
- Genus
- Macquaria
- Species
- colonorum
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