Control of water quality in the culture of early-stage phyllosomas of Panulirus japonicus
Abstract:A method for culturing phyllosomas of spiny lobster is characterized by use of the microalga Nannochloropsis oculata in the phyllosoma culture water. The method seems to be most effective during the microalgae growth phase due to the water purification activity of the microalgae. In contrast, accumulation of microalgae during the declining phase may cause a deterioration of water quality. The period necessary between changes of the culture medium was determined for early stage phyllosomas of Panulirus japonicus. The culture water was initially light green. The color gradually deepened and changed to yellow. The amount of chlorophyll a was relatively stable. Carotenoids/Chlorophyll a ratio was initially 0.30 and increased to 0.50 over about 2 wks. Chemical oxygen demand (COD) steadily increased to 1.2 - 1.5 ppm after 14 - 19 d. The rate of COD increase was lower in cultures which had higher microalgae growth rates. The initial concentration of ammonia-N, about 0.4 ppm, at the addition of the microalgae, which was removed within a few days. The bacterial number ranged between 4 × 103 and 3 × 104, and no significant effect due to bacteria was observed. Survival rate of phyllosomas was best when the culture water was changed every 13-14 d at initial concentration of Nannochloropsis at one million cells ml-1 and allowed to remain unchanged for 34 d.
Document Type: Research Article
Publication date: July 1, 1997
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