Alewife

{
  "id": "d8480ca2-525f-4d15-bb9b-643763ae847a",
  "commonName": "Alewife",
  "scientificName": "Alosa pseudoharengus",
  "slug": "alewife",
  "category": "anadromous",
  "aliases": [
    "River Herring",
    "River herring",
    "Sawbelly",
    "Grayback",
    "Branch herring",
    "Golden shad",
    "Bigeye herring"
  ],
  "description": "The alewife is a sleek, streamlined herring, built for distance. Its silver flanks, marked by a distinct dark spot just behind the gill cover, flash like a coin in the water. Typically ranging from 10 to 12 inches, though reaching up to 15, its body is laterally compressed with a sharp keel along the belly. Anglers will recognize the deeply forked tail and the pronounced, upturned lower jaw that just meets the tip of the snout. In spring spawning runs, males often take on a brassy or coppery hue, while the silver sheen remains the dominant feature when lifted from the water.",
  "imageUrl": "https://media.meridiaoutdoors.com/media/species/alewife/main.webp",
  "hero": {
    "blurhash": "UjQvwQWBxu%MkBWBofof~qt8axof?bt7WAWB",
    "altText": "Alewife (Alosa pseudoharengus) watercolor",
    "caption": "The alewife is a sleek, streamlined herring, built for distance.",
    "width": 2400,
    "height": 1340
  },
  "phases": [
    {
      "id": "98164771-7e8c-40ff-8505-f019b7f8a665",
      "name": "Ocean (or Coastal) Adult",
      "slug": "ocean-adult",
      "description": "The alewife lives the vast majority of its life in the salt, forming immense, shimmering schools in coastal waters and the open ocean. This phase is all about survival in the pelagic realm, feeding on plankton and small crustaceans while evading a gauntlet of predators from striped bass to whales.",
      "appearance": "The body is a classic, sleek herring shape—laterally compressed with a sharp, scute-lined keel along the belly. The dominant coloration is a brilliant, reflective silver across the flanks and belly, fading to a blue-green or gray-green on the back. A single, prominent dark spot is located just behind the upper edge of the gill cover. The deeply forked tail is dark, and the lower jaw is slightly upturned. Size typically ranges from 10 to 12 inches. Sexes appear identical.",
      "triggers": null,
      "habitat": "Marine environments, primarily in coastal waters, estuaries, and the open ocean, often at mid-depths.",
      "anglersNote": "This is the primary phase encountered by anglers using sabiki rigs for bait, and it's the critical forage base for gamefish like striped bass and bluefish.",
      "displayOrder": 0,
      "imageUrl": null,
      "media": null
    },
    {
      "id": "6f387e2c-9829-4190-a302-5db13fc76ad7",
      "name": "Spawning Male",
      "slug": "spawning-male",
      "description": "Driven by an ancient instinct, males migrate into freshwater rivers and lakes in spring. Their focus shifts entirely to reproduction, where they compete to fertilize eggs broadcast by females over gravel or sand substrate in massive, often frenzied congregations.",
      "appearance": "The body shape remains sleek but can appear slightly more robust. The most dramatic change is in coloration: the brilliant silver of the ocean phase is overlaid with a distinct brassy, coppery, or bronze iridescence, particularly on the head, shoulders, and upper flanks. The dorsal surface may darken. The dark spot behind the gill cover remains visible but can be less prominent against the new metallic hue.",
      "triggers": "Spring migration into freshwater, triggered by increasing water temperature and photoperiod, for spawning.",
      "habitat": "Freshwater streams, rivers, and landlocked lakes; gathers in shallow, flowing water over rocky or sandy bottoms.",
      "anglersNote": "Anglers may see these fish swarming in creeks; they are often caught incidentally or for use as fresh-cut bait. In some systems, they are a key prey for landlocked salmonids.",
      "displayOrder": 1,
      "imageUrl": null,
      "media": null
    }
  ],
  "contentUpdatedAt": "2026-05-09T22:32:34.383Z"
}

[]

[]

{
  "title": null,
  "description": "Alewife, or River Herring, are anadromous fish with silver flanks and a dark spot behind the gill cover. Known for spring spawning runs into freshwater.",
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  "ogDescription": "Alewife, also called River Herring, are anadromous fish found in coastal waters and freshwater rivers during spring spawning. Learn about their life cycle and angler notes.",
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  "focusKeyword": "alewife fishing",
  "secondaryKeywords": [
    "alewife",
    "alosa pseudoharengus",
    "anadromous",
    "river herring",
    "sawbelly",
    "grayback",
    "branch herring",
    "golden shad",
    "bigeye herring"
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