In short, yes. Here are the laws and potential fines if you were to choose to help wildlife in Queensland.

Queensland Fisheries Act 1994

87 Interference etc. with aquaculture activity or fishing apparatus

(1)A person must not unlawfully interfere with an aquaculture activity or fishing apparatus.
Maximum penalty—500 penalty units.

(2)In this section—
interfere with includes—
(a)for an aquaculture activity—the removal of fisheries resources, damage and destroy; and
(b)for fishing apparatus—
(i)the removal of fisheries resources; and
(ii)haul, pull, draw or reel in, or otherwise bring out of water; and
(iii)damage, destroy, mark, remove and trample.

31 Exclusion zone

(1)A person must not, without a reasonable excuse, be in the exclusion zone for shark control apparatus.

Maximum penalty—200 penalty units.

Note—

The locations of shark control apparatus are available on the department’s website.
(2)Subsection (1) does not apply to a person who is authorised, in writing, by the chief executive or an inspector to be in the exclusion zone for shark control apparatus for—
(a)installing, repairing or maintaining the apparatus; or
(b)freeing animals, persons or things caught in the apparatus.
(3)Also, subsection (1) does not apply to a person on a boat that transits through the exclusion zone for shark control apparatus—
(a)in a straight line or in the most appropriate or direct route, taking into account the circumstances of the waters; and
(b)without stopping.
(4)In this section—
exclusion zone, for shark control apparatus, means the area within 20m of the shark control apparatus.
shark control apparatus means any thing placed in or near water by the chief executive as part of the shark control program, including, for example—
(a)a net or line; and
(b)a buoy, float, hook, sinker or other thing connected to or otherwise associated with a net or line.