October
High country
Brown stoneflies (Zelandobius sp.) and long tailed stoneflies (Zelandoperla sp) at final nymphal moult stage. Abundant in fast flowing bouldery rivers. The green stonefly (Stenoperla prasina) is abundant throughout the season due to unsynchronised emergence. Stoneflies are most important to trout in periods of high flows as they rarely passively drift as mayflies do. The net building caddis (Aoteapsyche colonica) most abundant at this time of year, mostly found in the more rapid sections of the river. They are especially important in unstable braided rivers. The free-living green caddis, Hydrobiosis sp also common. Some species of Deleatidium mayflies emerging. The most common a brown mayfly with mottled brown and grey wings, with a body length of 10mm (Deleatidium myzobranchia). Other Deleatidium sp may be emerging, generally all are between 8 and 11mm with brown bodies and grey or mottled grey wings. Coloburiscus mayflies emerging characterised by a yellow patch at the base of the forewing and hind wing and a small middle tail filament. These are most common in forested fast flowing stable streams.
Low country
Most feeding activity centered on Deleatidium nymphs and cased caddis. Horn caddis (Olinga sp) and sandy cased caddis (Hudsonema or Pycnocentria sp) the most abundant. Sporadic emergence of Deleatidium sp common at in early afternoon. Aoteapsyche and Hydrobiosis caddis also abundant.