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27<br />

Fish identification and measurement<br />

Fish identification and measurement<br />

Most families of fish have a number of different species which can make identification difficult.<br />

It is important to know exactly what fish you catch as different regulations may apply to different<br />

species. Various reference books are available which clearly outline a fish’s defining characteristics.<br />

Some NSW species look quite similar. The following tips have been prepared to help identify<br />

popular species from similar looking fish.<br />

Australian Bass<br />

Snout length<br />

shorter than<br />

Estuary Perch.<br />

Pelvic fin<br />

white at<br />

leading margin.<br />

Snout profile – slightly<br />

concave to straight.<br />

Dark olive/grey/green on<br />

back fading to off-white<br />

or yellowish white below.<br />

Estuary Perch<br />

Snout profile<br />

– concave.<br />

Snout tapered and elongated<br />

(longer than Bass).<br />

Dark grey and silvery on<br />

back, paler below.<br />

All fins dark.<br />

Spiny Crayfish and Yabbies<br />

■■<br />

All Euastacus crayfish species have a set of spines along the bottom of the claws, making<br />

recognition relatively easy.<br />

■■<br />

Species of Euastacus crayfish can often be confused with the common yabby.<br />

■■<br />

Euastacus crayfish can also generally be distinguished from a yabby by its larger size and<br />

the presence of short robust spikes on its claws, carapace and abdomen. Yabbies are<br />

smooth shelled.<br />

Cherax Crayfish ‘Yabbies’<br />

Euastacus Crayfish ‘Spinies’<br />

NSW Recreational Freshwater Fishing Guide<br />

Smooth, no spines<br />

Rough, with spines<br />

Golden Perch and Silver Perch<br />

Small Golden Perch are often confused with small Silver Perch. Distinguishing features of Golden<br />

Perch are their olive green colouration, their yellow belly, their distinctly concave forehead above<br />

the eyes and their lower protruding jaw. In contrast, Silver Perch have a more silvery darker<br />

complexion on the back, are paler on the sides, have a white belly, have a smaller beak-like head,<br />

have a small mouth and small scales and their jaws are of equal length.<br />

Golden Perch<br />

Concave head.<br />

Protruding lower jaw.<br />

Olive green colouration.<br />

Silver Perch<br />

Small head, eyes.<br />

Jaws equal length.<br />

Darker silvery<br />

complexion on back.<br />

White belly.

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