Regulation control method for preventing oxygen deficiency at night in gracilaria and prawn ecological cultivation

Abstract

A regulation control method for preventing oxygen deficiency at night in the gracilaria and prawn ecological cultivation relates to the algae and prawn cultivation. The method comprises the steps of controlling the gracilaria cultivation density and prawn cultivation density: the prawn cultivation density is 100-300kg per mu, the gracilaria cultivation density is 400-750kg per mu in sunny days and 300-600kg per mu in rainy days, and when the cultivation density achieves the upper limit, one third to a half of the gracilaria is harvested and the rest gracilaria is continuously cultivated as seedlings; adopting Gracilaria lichenoides when the water temperature is higher than or equal to 20 DEG C and adopting Gracilaria tenuistipitata Var. liui when the water temperature is lower than 20 DEG C; regulating and controlling cultivation water depth: when the water body transparency is larger than 1m, the cultivation water depth is 0.5-1.0m in sunny days and 0.35-0.6m in rainy days and the cultivation water depth is 0.5-0.7m in sunny days and 0.35-0.5m in rainy days when the water transparency is smaller than or equal to 1m; regulating and controlling water entering: a cultivation pond is subjected to water changing on rainy days and adopts a water feeding-at-night and draining-at-daylight mode.

Description

technical field [0001] The invention relates to seaweed and prawn cultivation, in particular to a control method for preventing nocturnal hypoxia in the ecological cultivation of Gracilaria and prawns. Background technique [0002] Gracilaria lichevoides is a large red algae native to Taiwan and introduced to Fujian in the 1990s. It mainly grows in breeding ponds. The growing season is from summer to autumn. It is the most important fresh bait for abalone in summer and autumn. Good value for money. In order to improve the overall benefits of the breeding ponds, farmers often mix economic animals such as prawns in the Gracilaria breeding ponds to increase the breeding income. However, some farmers found that they only harvested very few finished prawns after putting in a large amount of larvae, but they did not know how other prawns disappeared. [0003] Dissolved oxygen (DO) is one of the most important environmental factors in the shrimp culture environment, it directly o...

AI Technical Summary

Problems solved by technology

After the prawns die, they sink to the bottom of the water until they rot, which is not easy to detect. Many farmers find that the yield of prawns is very low when they harvest, but they don’t know the reason. They seldom realize that Gracilaria, which can produce a large amount of DO, is under the condition of excessive breeding density. It will also consume a large amount of DO and cause nighttime water hypoxia

In the past, the ecological breeding of Gracilaria prawns mainly focused on the improvement of the water quality of Gracilaria prawn ponds. There have been no reports on the research on the lack of oxygen at night caused by the excessive breeding density of the two, and there have been no reports on related control measures.

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