English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

When the present investigation was commenced no information was available with regard to the food of trout in Australia, although considerable research had been carried out in New Zealand, which was being applied ina practical ma;nner in an endeavour to improve the conditions prevailing in the streams of the Dominion. We now know, subject to climatic and other variation, the principal insects a;nd other a;nimals constituting the food of our trout; this is a step in the right direction, but as the investigation has progressed it has become mote and more apparent that the laboratory work must be correlated with field research. A quantitative survey of the principal trout streams is essen tialf or the solution of a number of pro blems which have presented themselves during the course of the work. We know that certain insects are taken as food by the fish, but we do not know whether other insects, etc. are .present in the streams but are distasteful to the trout, nor do we know the relations between those species which have been proved to be of value as fish food. Caddis are present in the streams in varying numbers through the season, At some periods the caddis constitute the most important food item, but they may suddenly decline in numbers in the stomachs, although individual fish maybe still taking them in large numbers. At the periods of diminution in numbers of the caddis there is usually an increase in· the quantity of terrestrial insects taken, e.g.,Scarab::eid::e. It is important to discover in this and other cases whetherthe fish have a preference for the beetles and abandon the caddis in their favour, or whether the change in food is due to some sudden decrease in the number of the caddis.This aspect is apparent in the case of other insect.s. This is but one problem among many, but the solution can be obtained only by careful research in the field, and definite conclusions of value to the future of the Australian trout streams arrived at by the correlation between laboratory and ecological methods. I feel that this aspect cannot be t.oo strongly stressed.

The food of trout in New South Wales, 1933–1934