"American shad" meaning in English

{
  "forms": [
    {
      "form": "American shads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "American shad (plural American shads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Herrings",
          "orig": "en:Herrings",
          "parents": [
            "Fish",
            "Otocephalan fish",
            "Vertebrates",
            "Chordates",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alosa sapidissima, an anadromous clupeid fish naturally distributed on the North American coast of the North Atlantic, from Newfoundland to Florida, and as an introduced species on the North Pacific coast."
      ],
      "id": "en-American_shad-en-noun-uWhl-u0n",
      "links": [
        [
          "anadromous",
          "anadromous"
        ],
        [
          "clupeid",
          "clupeid"
        ],
        [
          "fish",
          "fish"
        ],
        [
          "North American",
          "North American"
        ]
      ]
    }
  ],
  "word": "American shad"
}

{
  "forms": [
    {
      "form": "American shads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "American shad (plural American shads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries using missing taxonomic name (species)",
        "en:Herrings"
      ],
      "glosses": [
        "Alosa sapidissima, an anadromous clupeid fish naturally distributed on the North American coast of the North Atlantic, from Newfoundland to Florida, and as an introduced species on the North Pacific coast."
      ],
      "links": [
        [
          "anadromous",
          "anadromous"
        ],
        [
          "clupeid",
          "clupeid"
        ],
        [
          "fish",
          "fish"
        ],
        [
          "North American",
          "North American"
        ]
      ]
    }
  ],
  "word": "American shad"
}