摘要:
将人工养殖的坛紫菜叶状体及与其有生长竞争关系的5种大型杂藻——肠浒苔、条浒苔、孔石莼、真江蓠、水云以及卵形藻等进行干露和冷藏实验.结果表明,坛紫菜叶状体干露至含水率10%~15%后直接培养,其成活率在99%以上,增重率与未经干露组的相比无显著差异;大型杂藻干露后含水率低于25%时则全部死亡;坛紫菜叶状体含水率为10%~15%时,在低温-20℃冷藏30d后进行培养,成活率达99%~100%,当含水率低于10%时,其成活率低于30%;坛紫菜叶状体含水率高于或低于10%~15%时进行低温冷藏,均会影响其成活率及冷藏后培养时的藻体增重率;与坛紫菜叶状体冷藏相同天数的大型杂藻,其死亡率达到100%;干露和冷藏可以有效地杀死与坛紫菜叶状体有竞争关系的杂藻,并且可以应用于生产以提高坛紫菜产量.
关键词:
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坛紫菜 /
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大型杂藻 /
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底栖硅藻 /
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干露 /
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冷藏
Abstract:
The manual cultured Porphyra haitanensis thallus and five large scale unwanted-alga which have growth competitive relations with P.haitanensis thallus:Enteromorphaintestinalis,E.clathrata,Ulva pertusa,Gracilaria asiatica and Ectocarp us confervoides,together with the samples of Cocconeis spp.,were tested by means of desiccation and cold preservation.The results indicated that when it was cultured directly after being desiccated to the water content of 10%~15%,the survival rate of the P.haitanensis thallus was over 99%,showing no significant difference from those without desiccation,where as all the large scale unwanted-alga would die if the water content was below 25% after desiccation.When the water content of the P.haitanensis thallus was 10%,culture them after being stored at a low temperature of 20 for 30 days,then the survival rate would reach up to 99%~100%.If the water ratio was below 10%,then the survival rate would belower than 30%,and death even occurred.When the P.haitanensis thallus was stored with the water content ratio higher or lower than 10%~15% under low temperature,both its survival rate and the rate of weight gain when cultured after cold preservation would get aff ected.However,cold preser vation duration would bring a 100% death rate to the large scale unwanted-alga.Therefore,the ways of desiccation and cold preservation could effectively kill the unwanted-algas that have competitive relations with P.haitanensis thallus,which could be applied to raising the yield of P.haitanensis in practice.
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