This paper reports on the first ever observations of jungle perch Kuhlia rupestris egg buoyancy and hatch rates over a range of salinities and represents important information for the husbandry of this species. Dead or unfertilized jungle perch eggs tend to sink in static seawater (>34,000 mg/L), whereas fertilized eggs tend to float. However, at salinities below 32,000 mg/L most fertilized eggs also sink, making it difficult to separate them from unfertilized eggs. Separating fertilized from unfertilized and dead eggs is important for maintaining water quality in aquaculture hatch tanks. Hatch rates of fertilized jungle perch eggs were significantly higher (p < 0.05) at salinities at or above 32,000 mg/L than at lower salinities. The highest mean buoyancy and hatch rates were recorded at 36,000 mg/L. This suggests that jungle perch are fully marine, rather than estuarine spawners. It is recommended that fertilized jungle perch eggs be held at salinities of 32,000 mg/L or higher to maximize hatch rates and to facilitate removal of dead egg material from hatch tanks.

中文翻译：

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盐度对丛林鲈鱼卵浮力和幼虫孵化率的影响

本文报告了对丛林鲈鱼Kuhlia rupestris卵在一定盐度范围内的浮力和孵化率的首次观察，并代表了该物种饲养的重要信息。死亡或未受精的丛林鲈鱼卵倾向于沉入静态海水（>34,000 mg/L），而受精卵倾向于漂浮。然而，在低于 32,000 毫克/升的盐度下，大多数受精卵也会下沉，因此很难将它们与未受精卵分开。将受精卵与未受精卵和死卵分开对于保持水产养殖孵化池的水质很重要。受精丛林鲈鱼卵的孵化率显着较高 ( p < 0.05) 在盐度等于或高于 32,000 毫克/升时比在低盐度时。最高平均浮力和孵化率记录为 36,000 毫克/升。这表明丛林鲈鱼是完全海洋的，而不是河口产卵者。建议将受精的丛林鲈鱼卵保存在 32,000 毫克/升或更高的盐度下，以最大限度地提高孵化率并促进从孵化池中清除死卵物质。