Any of various fishes;

• freshwater pike, green pike or pickerel
• large California rockfish
• A group of marine fish in the Carangidae family

• Leather jack
• Crevalle jack
• Yellow jack
• Bar jack
• Island jack
• Green jack
  
• Black jack
• Fortune jack
• Almaco jack
• Giant trevally

• A common name for the Coho salmon
• A Jack salmon may refer to the small percentage of Salmon returning to fresh water from the ocean after only one year.

References

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