212 XElIiOPTEROID IXSKCTS OF THK HOT SPRIXd.S IffXlIOX, X.Z., 



B. 



.1 



/>'. 



Double trap-net with leaded bottoms, suitable for river with unstable 



pumice bed, and set so as to catch trout running (foztiisiream. 

 Tlie same net, set with two extra pairs of steel-rope liraces, so as to 

 catch trout running !ipslrea)ii. 



Tlie arrows indicate the courses taken ))y the trout. 

 fj. — The nets should be so designed that xilenty of " slack" is sillowed 

 for above the leaden weights, so that, if a flood washes the pumice 

 liottom out, the slack will allow the net to sink without lifting 

 the weights from the bottom. 



considerable size. Roto-Aira is at pi'esent' tlic only possible lake that i-duld be 

 maintained as a sanctuary. 



I would therefore recommend that this Lake, tosetlier witii all streams Hew- 

 ing into it, and the Pouto River flowing out of it. to within a mile of its entry 

 into the Tongariro River (or to such point as will be suitable for the erection of 

 nets to ))revent access of trout) should be jiroclaitned a-« a Kaneliiari/ for the native 

 aquatic fauna, and that immediate steps should be taken to eliminate from this 

 area any of the trout that were surreptitiously introduced. 



