"blueback" meaning in English

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  "etymology_text": "From blue + back.",
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    {
      "form": "bluebacks",
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        "plural"
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  "pos": "noun",
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      "glosses": [
        "Any of several fish",
        "A lake trout (Salmo oquassa)."
      ],
      "id": "en-blueback-en-noun-moK8hyxF",
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        [
          "trout",
          "trout"
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      "glosses": [
        "Any of several fish",
        "A salmon (Oncorhynchus nerka)."
      ],
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          "Oncorhynchus nerka",
          "Oncorhynchus nerka#Translingual"
        ]
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    },
    {
      "categories": [],
      "glosses": [
        "Any of several fish",
        "A blueback herring or blueback shad (Alosa aestivalis, syn. Clupea aestivalis) similar to the alewife"
      ],
      "id": "en-blueback-en-noun-ejV1safZ",
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          "alewife",
          "alewife"
        ]
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          "_dis": "22 22 22 35",
          "kind": "lifeform",
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          "name": "Herrings",
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          "name": "Salmonids",
          "orig": "en:Salmonids",
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        "Any of several fish",
        "A Beardslee trout (Oncorhynchus mykiss irideus f. beardsleei)."
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  ],
  "etymology_text": "From blue + back.",
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    {
      "form": "bluebacks",
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        "plural"
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          "trout",
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        "Any of several fish",
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      ],
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          "Oncorhynchus nerka#Translingual"
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      ],
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          "fish"
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