There seems to be many different types of water conditions in dams; is there any pattern which is related to Yabby production?
There are large physical and chemical differences between farm dams and in the amount of crayfish they produce. We could measure many factors- and there are a lot- over a large number of Yabby dams for several years and hope that at the end there is some pattern. The more scientific method we are using in our experimental research program on yabbies over the next few years is to test and improve a theory developed some years ago from marron research in dams in the Kojonup area (Fisheries Research Bulletin No. 24, 1980. ” Production of marron in Western Australian wheatbelt farm dams”. By N. M. Morrissy). This theory related marron production to dam conditions, but obviously needs to be extended into more enriched dams for yabbies. Some important factors need to be considered separately- clay type, rainfall, evaporation, air temperatures, catchment calcium- as regional variations. Basically, our theory takes a series of dams on the slope of a typical wheatbelt valley and models the rang
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