{
    "river": {
        "name": "la Mayenne",
        "course_code": "M---0090",
        "topage_code": null
    },
    "dataset": "species",
    "extracted_at": "2026-09-22T01:53:35+02:00",
    "source_note": "RivièreScope agrège des données publiques ; consultez /sources/ pour les producteurs et licences.",
    "data": [
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            "individual_count": null,
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            "last_year": 2024
        },
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            "species_code": "2050",
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            "individual_count": null,
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            "last_year": 2024
        },
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            "observation_count": 372,
            "individual_count": null,
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            "last_year": 2024
        },
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            "species_code": "2135",
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            "observation_count": 281,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
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            "observation_count": 255,
            "individual_count": null,
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            "last_year": 2024
        },
        {
            "species_code": "2090",
            "common_name": "Ablette",
            "scientific_name": "Alburnus alburnus",
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            "observation_count": 248,
            "individual_count": null,
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            "last_year": 2024
        },
        {
            "species_code": "2193",
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            "observation_count": 217,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
        {
            "species_code": "2086",
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            "scientific_name": "Abramis brama",
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            "observation_count": 166,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
        {
            "species_code": "2177",
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            "scientific_name": "Ameiurus melas",
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            "observation_count": 123,
            "individual_count": null,
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            "last_year": 2012
        },
        {
            "species_code": "2038",
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            "observation_count": 107,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
        {
            "species_code": "31041",
            "common_name": "Chevaine",
            "scientific_name": "Leuciscus cephalus",
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            "observation_count": 77,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
        {
            "species_code": "2191",
            "common_name": "Grémille",
            "scientific_name": "Gymnocephalus cernua",
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            "observation_count": 44,
            "individual_count": null,
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            "last_year": 2022
        },
        {
            "species_code": "2085",
            "common_name": "Brème indéterminée",
            "scientific_name": "Abramis",
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            "observation_count": 44,
            "individual_count": null,
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            "last_year": 2014
        },
        {
            "species_code": "2113",
            "common_name": "Goujon commun",
            "scientific_name": "Gobio gobio",
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            "observation_count": 31,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
        {
            "species_code": "2238",
            "common_name": "Silure glane",
            "scientific_name": "Silurus glanis",
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            "observation_count": 30,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
        {
            "species_code": "2151",
            "common_name": "Brochet commun",
            "scientific_name": "Esox lucius",
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            "observation_count": 17,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
        {
            "species_code": "2195",
            "common_name": "Sandre",
            "scientific_name": "Sander lucioperca",
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            "observation_count": 12,
            "individual_count": null,
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            "last_year": 2022
        },
        {
            "species_code": "68137",
            "common_name": "Ecrevisse américaine",
            "scientific_name": "Faxonius limosus",
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            "observation_count": 10,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
        {
            "species_code": "68136",
            "common_name": "Aspe",
            "scientific_name": "Leuciscus aspius",
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            "observation_count": 10,
            "individual_count": null,
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            "last_year": 2022
        },
        {
            "species_code": "2110",
            "common_name": "Carpe commune",
            "scientific_name": "Cyprinus carpio",
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            "observation_count": 9,
            "individual_count": null,
            "first_year": 2010,
            "last_year": 2024
        },
        {
            "species_code": "2053",
            "common_name": "Black bass à grande bouche",
            "scientific_name": "Micropterus salmoides",
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            "observation_count": 7,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2014
        },
        {
            "species_code": "2129",
            "common_name": "Pseudorasbora",
            "scientific_name": "Pseudorasbora parva",
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            "observation_count": 6,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2024
        },
        {
            "species_code": "2084",
            "common_name": "Cyprinidé indéterminé (Cyprinidae)",
            "scientific_name": "Cyprinidae sp.",
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            "observation_count": 5,
            "individual_count": null,
            "first_year": 2014,
            "last_year": 2014
        },
        {
            "species_code": "20550",
            "common_name": "Carassin argenté",
            "scientific_name": "Carassius gibelio",
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            "observation_count": 3,
            "individual_count": null,
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            "last_year": 2020
        },
        {
            "species_code": "2122",
            "common_name": "Vandoise",
            "scientific_name": "Leuciscus leuciscus",
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            "observation_count": 1,
            "individual_count": null,
            "first_year": 2008,
            "last_year": 2008
        },
        {
            "species_code": "2028",
            "common_name": "Ecrevisse de Louisiane",
            "scientific_name": "Procambarus clarkii",
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            "observation_count": 1,
            "individual_count": null,
            "first_year": 2024,
            "last_year": 2024
        },
        {
            "species_code": "2137",
            "common_name": "Tanche",
            "scientific_name": "Tinca tinca",
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            "observation_count": 1,
            "individual_count": null,
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            "last_year": 2024
        }
    ]
}