The suitability of inland saline groundwater as a medium to culture juvenile cobia, Rachycentron canadum, was assessed. In the first experiment, juvenile cobia stocked in raw (unamended) saline groundwater at salinities of 5, 10, and 15 g/L exhibited complete mortality after 108, 176, and 195 hr, respectively. The second experiment evaluated the rearing of juvenile cobia (mean weight ~9.23 ± 0.12 g) in potassium (K⁺)‐amended saline groundwater (100% K⁺ fortified) and reconstituted seawater at salinities of 5, 10, and 15 g/L to assess growth and osmoregulation in distinct culture media. Following 60 days of culture, all fish survived the experimental period. Final mean bodyweight of cobia reared in K⁺‐amended saline groundwater (103.2–115.8 g) and seawater (111.2–113.8 g) of different salinities did not vary significantly (p > .05). No differences (p > .05) were observed in specific growth rate, weight gain (%), and feed conversion ratio between treatment groups. Serum osmolality increased with salinity and was significantly higher (p < .05) for fish in K⁺‐amended saline groundwater (353–361 mOsmol/Kg) than in reconstituted seawater (319–332 mOsmol/Kg), although differences were not observed between salinities by water type. Cobia stocked in saline groundwater of different salinities were osmoregulating normally, and the higher values observed may be because of variations in ionic composition and other interfering ions in saline groundwater. Trial results suggest that juvenile cobia can achieve optimal growth in K⁺‐amended saline groundwater of low and intermediate salinities.

中文翻译：

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盐度对钾改良内陆盐碱地下水饲养的少年军曹鱼加拿大短吻鲈（Rachycentron canadum，Linnaeus 1766）生长特性和渗透调节的影响

评估了内陆盐碱地下水作为培养少年军曹鱼Rachycentron canadum的培养基的适用性。在第一个实验中，盐度为5、10和15 g / L的原始（未推荐）盐水中储存的少年军曹鱼分别在108、176和195小时后表现出完全的死亡率。第二个实验评估了盐度分别为5、10和15 g / L的钾（K ⁺）修正的盐水地下水（100％K ⁺强化）和再生海水中的少年军曹鱼（平均体重〜9.23 ±0.12 g）的饲养评估不同培养基中的生长和渗透压。培养60天后，所有鱼都存活了实验期。军曹鱼的最终平均体重以K ^+表示盐度不同的经修正的盐碱地下水（103.2–115.8 g）和海水（111.2–113.8 g）的变化不显着（p  > .05）。 治疗组之间的特定生长率，体重增加（％）和饲料转化率没有差异（p > .05）。盐度渗透压随盐度增加而增加， 在K ^+中，鱼的渗透压显着更高（p <.05）修正后的盐碱地下水（353-361 mOsmol / Kg）比重新配制的海水（319-332 mOsmol / Kg）高，尽管不同类型的盐度之间没有发现差异。盐度不同的咸水地下水中储存的军曹鱼通常处于渗透压状态，观察到的较高值可能是由于咸水地下水中离子组成和其他干扰离子的变化所致。试验结果表明，军曹鱼可实现以K最佳生长⁺ -amended低，中盐度的地下咸水。