Noranda man Junever Vizcarra Tolentino was at the North Mole on April 16 when Fisheries and Marine Officers approached him.
The officers told the court that Tolentino tipped out the contents of the esky when he saw them approaching and ran from the area before being apprehended.
MORE: Cockburn Sound snapper fishing ban one of the most important
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READ NOWOne of the officers recovered 11 undersized pink snapper from the water, ranging in size from 180mm to 200mm.
The legal minimum length for pink snapper is 500mm and a bag limit of two a day per fisher also applies.
Tolentino was fined $2000 for two offences, as well as $2805 for possessing a protected fish and court costs of $188.
North Metropolitan compliance manager Todd A’Vard said Fisheries officers played an important part in enforcing fish resources.
Anyone with information about illegal fishing activity is asked to call FishWatch on 1800 815 507.