. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 182 A. F. MENSINGER AND J. F. CASE thesis mechanism (Barnes el a/., 1973). Ingestion of small numbers of luminescent ostracods rendered northern adults capable of luminescence for up to two years, with light yield greater than was considered theoretically pos- sible for the amount of luciferin consumed, suggesting that de novo synthesis is triggered by exogenous luciferin or that there is a recycling mechanism (Thompson el al, 1988a). A preferential mechanism for rapid uptake of lu- ciferin from the digestive system has also
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 182 A. F. MENSINGER AND J. F. CASE thesis mechanism (Barnes el a/., 1973). Ingestion of small numbers of luminescent ostracods rendered northern adults capable of luminescence for up to two years, with light yield greater than was considered theoretically pos- sible for the amount of luciferin consumed, suggesting that de novo synthesis is triggered by exogenous luciferin or that there is a recycling mechanism (Thompson el al, 1988a). A preferential mechanism for rapid uptake of lu- ciferin from the digestive system has also been reported in P. notatus (Thompson el al., 1988b). The purpose of our study was to observe the effects of a luciferin-free diet on the development of biolumines- cence in P. notatus juveniles of the southern population and to ascertain whether the fish of this population need exogenous sources of luciferin to remain luminescent. To this end, light emission was quantified from its onset in larval fish through the first two years in laboratory-reared and in locally collected individuals of P. notatus. The ef- fects of multiple challenges with noradrenalin on the de- pletion of luminescence in the fish are described as are experiments that contributed to the evaluation of the lu- ciferin recycling hypothesis. Materials, Methods and Results Collection Breeding pairs of P. notatus were collected intertidally along the Pacific Coast, just north of Santa Barbara, Cal- ifornia. They were maintained in large aquaria with sand filtered, running seawater (16-20°C). Masonry and large, inverted abalone shells provided nesting sites. Mating usually ensued during the first night in captivity and pro- duced between 100-400 eggs. Females were removed after spawning and males were retained to maintain the nests. Additional nests with guardian males were obtained by divers. After larval detachment (35-50 days post-fertil- ization), juveniles were placed in aquaria with sand-cov- ered bottoms
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