diff --git a/backend/geonature/core/gn_synthese/routes.py b/backend/geonature/core/gn_synthese/routes.py
index 8464a9aa6e..05ab3791a1 100644
--- a/backend/geonature/core/gn_synthese/routes.py
+++ b/backend/geonature/core/gn_synthese/routes.py
@@ -43,6 +43,7 @@
 from geonature.core.gn_synthese.models import (
     BibReportsTypes,
     CorAreaSynthese,
+    CorObserverSynthese,
     DefaultsNomenclaturesValue,
     Synthese,
     TSources,
@@ -51,6 +52,13 @@
     TReport,
     SyntheseLogEntry,
 )
+from geonature.core.gn_commons.models import (
+    TMedias
+)
+from geonature.core.gn_commons.models import (TMedias)
+
+from pypnusershub.db import User
+
 from geonature.core.gn_synthese.synthese_config import MANDATORY_COLUMNS
 from geonature.core.gn_synthese.utils.species_sheet import SpeciesSheetUtils
 
@@ -1027,16 +1035,20 @@ def species_observers(scope, cd_ref):
         page = request.args.get("page", 1, int)
 
         taxref_cd_nom_list = SpeciesSheetUtils.get_cd_nom_list_from_cd_ref(cd_ref)
+
         query = (
             db.session.query(
-                func.trim(func.unnest(func.string_to_array(Synthese.observers, ","))).label(
-                    "observer"
-                ),
+                User.id_role.label('id_observer'),
+                func.concat(User.prenom_role, ' ', User.nom_role).label('observer'),
                 func.min(Synthese.date_min).label("date_min"),
                 func.max(Synthese.date_max).label("date_max"),
-                func.count(Synthese.observers).label("count"),
+                func.count(Synthese.id_synthese).label("observation_count"),
+                func.count(TMedias.uuid_attached_row).label("media_count"),
             )
-            .group_by("observer")
+            .group_by(User.id_role)
+            .join(CorObserverSynthese, CorObserverSynthese.id_synthese == Synthese.id_synthese)
+            .join(User, User.id_role == CorObserverSynthese.id_role)
+            .outerjoin(TMedias, TMedias.uuid_attached_row == Synthese.unique_id_sinp)
             .where(Synthese.cd_nom.in_(taxref_cd_nom_list))
         )
         query = SpeciesSheetUtils.get_synthese_query_with_scope(g.current_user, scope, query)
diff --git a/frontend/src/app/syntheseModule/taxon-sheet/tab-observers/tab-observers.component.ts b/frontend/src/app/syntheseModule/taxon-sheet/tab-observers/tab-observers.component.ts
index b75e24e1ff..e5157e6153 100644
--- a/frontend/src/app/syntheseModule/taxon-sheet/tab-observers/tab-observers.component.ts
+++ b/frontend/src/app/syntheseModule/taxon-sheet/tab-observers/tab-observers.component.ts
@@ -24,7 +24,8 @@ export class TabObserversComponent implements OnInit {
     { prop: 'observer', name: 'Observateur' },
     { prop: 'date_min', name: 'Plus ancienne' },
     { prop: 'date_max', name: 'Plus récente' },
-    { prop: 'count', name: "Nombre d'observations" },
+    { prop: 'observation_count', name: "Nombre d'observations" },
+    { prop: 'media_count', name: "Nombre de media" },
   ];
 
   constructor(