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首页> 外文期刊>Aquaculture Research >Polyculture of western white shrimp, Litopenaeus vannamei Boone, 1931 with Grey mullet, Mugil cephalus Linnaeus, 1758 controls external parasites of western white shrimp
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Polyculture of western white shrimp, Litopenaeus vannamei Boone, 1931 with Grey mullet, Mugil cephalus Linnaeus, 1758 controls external parasites of western white shrimp

机译：西部白虾南美白对虾的混养，1931年与灰鱼，Mugil cephalus Linnaeus，1758年混养，控制西部白虾的外部寄生虫

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The main aim of this study was to examine the effects of a polyculture system on the control of the external parasites of western white shrimp, Litopenaeus vannamei. To this end, the western white shrimp postlarvae (PLs) were stocked in nine earthen ponds (600m(2)) at a density of 20PLsm(-2) and reared for 4months. After 40 days of shrimp stocking, Mullets, Mugil cephalus, were stocked at various densities including: control (0 fish/100m(2) pond), treatment 1 (T-1: 2 fish/100m(2) pond) and treatment 2 (T-2: 4 fish/100m(2) pond). Over the course of the experiment, the external parasites of shrimps were investigated by the preparation of a wet mount from the gill tissue. Based on the obtained results, totally two genera of protozoan parasites, i.e. Zoothamnium sp. and Epistylis sp., were identified over the course of the experiment. In all experimental groups, the incidence and abundance of Zoothamnium sp. was significantly higher than Epistylis sp. (P0.05). Also, mean incidence per cent and mean abundance of Zoothamnium sp. and Epistylis sp. were significantly lower in the polyculture treatments (T-1 and T-2) compared to the monoculture group (control) (P0.05). Throughout this experiment, the total organic matter (TOM %) content of the bottom sediments and biological oxygen demand (BOD5 mgL(-1)) of water samples in the polyculture ponds were significantly lower than the monoculture group (P0.05). In contrast, the polyculture ponds had a higher concentration of water dissolved oxygen (O(2)mgL(-1)) compared to the monoculture (P0.05). In conclusion, our results show that mullet as a secondary farmed species can reduce indirectly the parasitic pollution of western white shrimp probably through reducing the total organic matters in water and sediments and improving the water quality parameters.
机译：这项研究的主要目的是检验混养系统对西部白虾南美白对虾的体外寄生虫控制的影响。为此，将西部白虾幼体（PLs）放到9个土池（600m（2））中，密度为20PLsm（-2），并饲养4个月。虾放养40天后，以各种密度放养Mul鱼（Mugil cephalus），包括：对照（0条鱼/ 100m（2）池塘），处理1（T-1：2条鱼/ 100m（2）池塘）和处理2 （T-2：4条鱼/ 100m（2）池塘）。在整个实验过程中，通过从the组织制备湿坐垫来研究虾的外部寄生虫。根据获得的结果，总共有两个属的原生动物寄生虫，即兽疫菌。和Epistylis sp。，在实验过程中被确定。在所有实验组中，人兽共患病菌的发生率和丰度。明显高于Epistylis sp。 （P ＜0.05）。同样，动虫种的平均发病率和平均丰度。和Epistylis sp。与单一培养组（对照组）相比，在多元培养组（T-1和T-2）中，其含量显着降低（P <0.05）。在整个实验过程中，混养池底部水沉积物的总有机质（TOM％）含量和水样的生物需氧量（BOD5 mgL（-1））显着低于单一养殖组（P <0.05）。相比之下，与单作养殖相比，混养池塘的水溶解氧浓度更高（O（2）mgL（-1））（P <0.05）。总之，我们的研究结果表明，鱼作为次生养殖物种可以通过减少水和沉积物中的总有机物含量并改善水质参数来间接减少西部白虾的寄生虫污染。

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