Abstract
A brood stock of 3-year-old grey mullet ( Mugil cephalus L.) was maintained in two small rubber-lined outdoor ponds with circulating sea water. Plastic substrate consisting of weighted polyethylene strips was placed in each pond to increase surface area and provide a stable supply of benthic diatoms, blue-green and filamentous green algae. Water chemistry and daily fluctuations in oxygen, pH and temperature were monitored. Some fish developed air embolisms resulting from oxygen supersaturation, causing mortality. All males and females matured the following year and those not sacrificed for experimental data were induced to spawn by hormone injections.
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