Effects of salinity on Streptococcus infection of Nile tilapia, Oreochromis niloticus.
Effects of salinity on Streptococcus infection of Nile tilapia, Oreochromis niloticus.
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DOI：
10.1300/j028v06n01_04
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发表时间：
1996-01-01
影响因子：
1.2
通讯作者：
Plumb, J. A.
中科院分区：
文献类型：
--
作者：
Chang, P. H.;Plumb, J. A.
研究了0、15和30 ppm （ppt）盐度对尼罗罗非鱼（Oreochromis niloticus）在25和30℃条件下感染3株链球菌的影响。链球菌易感性增加与25°C和30°C时盐度升高有关。在25°C下，盐度为15 ppt的罗非鱼的死亡率并不明显高于0 ppt，但在25°C下，30 ppt的链球菌感染罗非鱼死亡率明显高于0或15 ppt的盐度。在30°C条件下，15 ppm盐度下感染2株链球菌的鱼的死亡率明显高于0 ppm盐度下的死亡率。30°C盐度为0或15°C的各组鱼的死亡率均显著高于25°C盐度的相应组。平均死亡时间一般随着温度从25°C增加到30°C而减少，但在大多数情况下，当盐度从0°C增加到15°C和30°C时，差异更大。
The effects of 0, 15, and 30 parts per thousand (ppt) salinities on infection of Nile tilapia (Oreochromis niloticus) with 3 isolates of Streptococcus spp. at 25 and 30°C were determined. Increased susceptibility to Streptococcus was associated with elevated salinities at 25 and 30°C. Mortalities were not significantly higher in 15 ppt salinity than 0 ppt at 25°C, but at this temperature, mortalities of Streptococcus infected tilapia were significantly higher at 30 ppt than at 0 or 15 ppt salinities. At 30°C, mortalities of fish infected with 2 Streptococcus isolates were significantly higher at 15 ppt than at 0 ppt salinities. All groups of fish at 30°C in 0 ppt or 15 ppt salinities had significantly higher mortalities than the corresponding groups held at 25°C. Mean time to death generally decreased as temperature was increased from 25 to 30°C, but a greater difference was noted in most instances as salinity increased from 0 ppt to 15 ppt and 30 ppt.