AN ALTERNATIVE EGG-INCUBATION JAR

Inexpensive hatching and incubation jars have been constructed in the past from polyvinyl chloride fittings or plastic bottles. Most cost le ss than $50 each, but contain numerous parts. The incubation jar descr ibed in this report was easy to assemble, recyclable, and cost about U S$2.50. It took about 10 min to construct and 24 h for the sealant to cure before use. Eggs of common carp Cyprinus carpio in quantities of 2,000-80,000 were hatched in these jars by adjusting water flow. The s mall size (2.3-L volume) provided separation of many treatments in a c onfined area.