Abstract

Production systems have been developed whereby crayfish crops, fish crops, and agricultural crops are grown together or are alternated for the mutual benefit of all. In rice/crayfish double cropping, rice stubble provides food substrate for crayfish. Since crayfish are grown through cooler months, virtually all vegetation is eliminated by the following spring when rice is replanted. This eliminates the need for herbicides in rice production. Since fields remain leveed through winter months, soil erosion is stopped, and one can utilize winter rains to keep ponds filled. Crayfish, by their activities tiller the soil, thus eliminating the need to disc the soil prior to rice plantings. Crayfish shells contain a pigment which is used in salmon feeds to impart a pink colour to the flesh.

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