How to Identify Estuary Perch

To identify Estuary Perch (Macquaria colonorum), look at these key features.

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

1. 1

   Body Shape

   Look for a deep, compressed body, distinct from the more elongated shape of Australian Bass.

2. 2

   Head Profile

   The dorsal profile of the head is typically concave, especially above the eyes.

3. 3

   Dorsal Fins

   Two dorsal fins are present, almost joined, with the spiny anterior dorsal fin being prominent.

4. 4

   Coloration

   Dark olive to bronze back, silvery flanks, and a white belly. Can be darker in tannin-stained waters.

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