Ask Dr Dazza: Identifying javelin fish

Posted: 5am 27 Mar 2022

Moreton Bay has a wonderfully diverse array of fish for the recreational angler to catch, but this can lead to problems for anglers to correctly identify them and know the correct size and bag limits.

It is common for anglers to rely on social media for fish identification, but the responses received are not always correct.

In a previous column, I discussed the subtle physical differences between grass sweetlip and spangled emperor, both which are caught in Moreton Bay.

Let’s move on to javelin fish or as they are also called grunter bream. They frequently “grunt” on capture – hence one of their common names.

There are two species that occur – the barred javelin fish (Pomadasys kaakan) and the small spotted javelin fish (Pomadasys argenteus). Anglers unfamiliar with them frequently mistake them for yellowfin bream. While they are both the general shape of the common yellowfin bream, they differ by having a square tail.

Of the two species of javelin fish, the spotted javelin fish is more common and widely distributed in Moreton Bay. They can be found in the upper reaches of rivers and creeks although they can aggregate in downstream areas – particularly after rain events. Large examples of barred javelin fish can turn up at places like Mud Island.

As their names suggest, small spotted javelin fish are covered by a series of small spots across their sides, while the barred javelin fish has spots arranged in a series of distinct wide vertical bars.

Barred javelin fish grow substantially larger than spotted javelin fish and both species have different legal sizes. The small spotted javelin fish has a minimum legal size of 30cm whereas the barred javelin fish has a minimum legal size of 40cm. Therefore, it is important to be able to tell the two species apart! Failure to do so risks a fine for keeping an undersized fish if the 35cm javelin fish you retain happens to be a barred javelin fish.

Local anglers also confuse fingermark bream (Lutjanus johnii) with Moses perch (Lutjanus russelli). To further confuse things, a second species of Moses Perch (Lutjanus fulviflamma) more typically found further north is becoming more common in Moreton Bay – at least where I fish.

These species along with many others have a “false eye spot” which is thought to be a visual adaptation to reduce predation risk. The false eye spot is usually bigger than the fish’s actual eye. Although I have seen a couple of actual juvenile fingermark bream in Moreton Bay in my over 35 years fishing, if you catch what you think is fingermark bream in the Moreton region there is a 99.9 per cent chance it is a Moses Perch.

Tight lines everyone, but make sure you know what was on your line before you keep it!

More from Dr Dazza

Boating & Fishing   •   11-8-2021  •   Dr Dazza

Ask Dr Dazza | Recreational fishing contributes to positive mental health

Recreational fishing contributes positively to personal wellbeing and mental health. Recreational fishing was highlighted by approximately 80 per cent of survey respondents identifying fishing as important or very important to their health and wellbeing.…

Boating & Fishing   •   11-2-2022  •   Dr Dazza

Ask Dr Dazza - Flathead

FLATHEAD are always a popular target for recreational fishers. Flathead belong to the family Platycephalidae and there are approximately 80 species known worldwide and well over half of these are known from Australia.…

Boating & Fishing   •   25-2-2022  •   Dr Dazza

Ask Dr Dazza | Turtles

THERE are seven species of marine turtles in the world and six are known from Australian waters. Moreton Bay is a marine turtle hotspot with three species commonly using the Moreton Bay Region. …



Annette's lifetime love of tennis

Annette Herbener has spent a lifetime in tennis. She loves the sport, everything about it, except one thing – matches.…

Holidays packed with fun at the Y

The Y-Mango Hill Gymnastics Youth and Community Centre has kids of all ages covered for the winter school holidays.…

More you might like:


Local News   •   18-5-2022  •   Nick Crockford

Revealed: Region's vital road projects on election wish lists

The State’s peak motoring body is calling on all political parties and candidates to green-light vital road and transport projects in the Moreton Bay.…

Local News   •   18-5-2022  •   Ashleigh Howarth

Moreton Kids Festival cancelled due to wet weather

Following the recent downpours, and more wet weather on the way, organisers of this year’s Moreton Kids Festival have made the difficult decision to cancel the event. Find out more here …

Local News   •   18-5-2022  •   Kylie Knight

Another big deal for Dolphins

It’s been a busy few weeks for the Dolphins, signing players for the 2023 season and today they announce a partnership deal they say is a perfect fit for their “challenger mentality”. Here’s what we know and what Head Coach Wayne Bennett has to say about the squad he’s building…

Local News   •   18-5-2022  •   Kylie Knight

Warriors need strong start to slay Dragons

The Warriors will need to start strongly and play consistent footy against St George Illawarra Dragons in their round 11 clash in Sydney this weekend, according to Head Coach Nathan Brown. Here’s what he had to say…

Local News   •   18-5-2022  •   Ashleigh Howarth

Woodcrafters celebrate 30 years of learning and friendship

There was plenty of reminiscing and laughs shared between friends from the Redcliffe and District Woodcraft Society as they gathered to celebrate the group’s 30th anniversary. You can find out more about the group here…

Local News   •   18-5-2022  •   Jodie Powell

The split second that changed a Senior-Constable’s life

Senior-Constable John Kenworthy has been riding motorcycles for decades. But a crash in 2020 changed his life forever. As part of National Road Safety Week, here’s his story……