Studies on polyculture of fish and sterile Ulva: observations of PO2 and PCO2 in fish culture farm

Hirata H., . and Yamasaki S., . and Kohirata E., . and Maenosono H., . and Yamauchi T., . and Matsuba M., . (1997) Studies on polyculture of fish and sterile Ulva: observations of PO2 and PCO2 in fish culture farm. [Proceedings Paper]

We consider that polyculture system of fish and sea weeds is of vital importance for aquaculture. The polyculture system however has not drawn its share of attention inspite of its significance from the ecological point of view. This may be due to the fact that fish and seaweeds have different growth seasons. Fish grow in summer and autumn while seaweeds propagate in winter and spring. In our previous report we explained culture methods of sterile Ulva sp. which grow in summer as do fish. Following those methods we studied the interaction between PO2 and PCO2 in polyculture cages of red seabream. Pagrus major and Ulva sp. at the fish culture farm of Azumacho Fish Seedling Centre. Two cages 7 x 7 x 7 m each having 1 000 fish of three years old weighing about 800 g were used for this purpose. PO2 and PCO2 were measured by radiometer ABL 330. The results were as follows. PO2 in the cages recorded 160-170 mm Hg during the day and 150-160 mm Hg at night. In the meantime PCO2 was registered at 58.6 mm Hg in the morning and 51.4 mm Hg in the evening. At rising tide PO2 and PCO2 recorded 163 mm Hg and 54 mm Hg respectively in the upper stream and 152 mm Hg and 57 mm Hg in the lower stream. These figures reveal the ecological significance of cultivating fish and seaweeds together to maintain the oxygen and carbon dioxide balance.

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Abstract

We consider that polyculture system of fish and sea weeds is of vital importance for aquaculture. The polyculture system however has not drawn its share of attention inspite of its significance from the ecological point of view. This may be due to the fact that fish and seaweeds have different growth seasons. Fish grow in summer and autumn while seaweeds propagate in winter and spring. In our previous report we explained culture methods of sterile Ulva sp. which grow in summer as do fish. Following those methods we studied the interaction between PO2 and PCO2 in polyculture cages of red seabream. Pagrus major and Ulva sp. at the fish culture farm of Azumacho Fish Seedling Centre. Two cages 7 x 7 x 7 m each having 1 000 fish of three years old weighing about 800 g were used for this purpose. PO2 and PCO2 were measured by radiometer ABL 330. The results were as follows. PO2 in the cages recorded 160-170 mm Hg during the day and 150-160 mm Hg at night. In the meantime PCO2 was registered at 58.6 mm Hg in the morning and 51.4 mm Hg in the evening. At rising tide PO2 and PCO2 recorded 163 mm Hg and 54 mm Hg respectively in the upper stream and 152 mm Hg and 57 mm Hg in the lower stream. These figures reveal the ecological significance of cultivating fish and seaweeds together to maintain the oxygen and carbon dioxide balance.

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Item Type:	Proceedings Paper
Additional Information:	Summary only En
AGROVOC Term:	FISH
AGROVOC Term:	POLYCULTURE AQUACULTURE
AGROVOC Term:	SEAWEEDS
AGROVOC Term:	AQUACULTURE
AGROVOC Term:	ECOLOGY
AGROVOC Term:	ENVIRONMENTAL FACTORS
AGROVOC Term:	FISH CULTURE
AGROVOC Term:	MALAYSIA
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16208

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