In floodplain waterholes of the Maci

In floodplain waterholes of the Macintyre River, Ambassis agassizii tended to feed more on calanoids and, to a lesser extent on daphniid cladocerans, as it grew, whereas smaller individuals tended to consume more moinid cladocerans than larger ones. There is no information from the literature indicating ontogenetic shifts in diet composition of Ambassis agassizii. However, Kennard (1995) described size-related changes in the diet of a similar species, Ambassis macleayi, in floodplain lagoons of the Normanby River (Cape York Peninsula, north Queensland). Results from Kennard (1995) show that smaller individuals (18 mm SL) presented a less diverse diet and relied mostly on cladocerans (69.1% mean proportional contribution to their diet) and chironomids (18% mean proportional contribution), whereas larger individuals ([18 mm SL) presented a more diverse diet with an increase in consumption of aquatic invertebrates (mostly chironomids, corixids, notonectids, ephemeropterans, and trichopterans) and decreased consumption of cladocerans (from 69.1% to 44.1%). In contrast, Arthington (1992) found that individuals of Ambassis agassizii of a size range similar to the ones examined in this study (22–45 mm SL) consumed exclusively aquatic insects and terrestrial material in tributary streams of the Brisbane River.