diff --git a/apps/api/app/activity.py b/apps/api/app/activity.py
index 245f253..18ba30a 100644
--- a/apps/api/app/activity.py
+++ b/apps/api/app/activity.py
@@ -56,6 +56,11 @@ def activity_rows(
         activity = round(55 * min(1, weighted / 12) + 25 * min(1, len(players) / 6) + 20 * min(1, trophies / 3))
         average_confidence = sum(r.source_confidence for r in items) / len(items)
         confidence = round(45 * min(1, len(items) / 10) + 35 * min(1, len(players) / 5) + 20 * average_confidence / 100)
+        # Cap confidence: 1 player → max 50%, 2 players → max 65%
+        if len(players) == 1:
+            confidence = min(confidence, 50)
+        elif len(players) == 2:
+            confidence = min(confidence, 65)
         latest = max(_aware(r.reported_at) for r in items)
         baits = Counter(r.bait.name for r in items if r.bait)
         freshness_text = _freshness_text(now - latest)
diff --git a/apps/api/app/community_importer.py b/apps/api/app/community_importer.py
index c128278..b908331 100644
--- a/apps/api/app/community_importer.py
+++ b/apps/api/app/community_importer.py
@@ -9,7 +9,7 @@ from sqlalchemy import select
 from sqlalchemy.orm import Session
 
 from .community_review import publish_observation
-from .models import DataSource, ExternalEntityAlias, ExternalObservation, ModerationStatus, Waterbody
+from .models import DataSource, ExternalEntityAlias, ExternalObservation, Fish, ModerationStatus, Waterbody
 
 
 SOURCE_DEFAULTS = {
@@ -112,12 +112,22 @@ def _auto_publish(session: Session, observation: ExternalObservation) -> bool:
         or observation.weight_g is None
     ):
         return False
-    fish_alias = session.scalar(select(ExternalEntityAlias).where(
-        ExternalEntityAlias.source_system == observation.source_system,
-        ExternalEntityAlias.entity_type == "fish",
-        ExternalEntityAlias.external_id == observation.fish_external_id,
-    ))
-    if fish_alias is None or fish_alias.fish is None:
+    # Fish: prefer external alias, fall back to exact name match
+    fish = None
+    if observation.fish_external_id is not None:
+        fish_alias = session.scalar(select(ExternalEntityAlias).where(
+            ExternalEntityAlias.source_system == observation.source_system,
+            ExternalEntityAlias.entity_type == "fish",
+            ExternalEntityAlias.external_id == observation.fish_external_id,
+        ))
+        if fish_alias and fish_alias.fish:
+            fish = fish_alias.fish
+    if fish is None:
+        # Fallback: exact name match
+        fish = session.scalar(
+            select(Fish).where(Fish.name_ru == observation.fish_name)
+        )
+    if fish is None:
         return False
     # Waterbody: prefer external alias, fall back to exact name match
     waterbody = None
@@ -136,7 +146,7 @@ def _auto_publish(session: Session, observation: ExternalObservation) -> bool:
         )
     if waterbody is None:
         return False
-    observation.fish = fish_alias.fish
+    observation.fish = fish
     observation.waterbody = waterbody
     observation.status = "ready"
     observation.review_note = "Automatically matched by previously reviewed source aliases"
diff --git a/apps/api/app/community_review.py b/apps/api/app/community_review.py
index 76cc77c..0be9abc 100644
--- a/apps/api/app/community_review.py
+++ b/apps/api/app/community_review.py
@@ -80,7 +80,7 @@ def publish_observation(session: Session, observation: ExternalObservation) -> C
         rig_type=observation.payload.get("rig_type"),
         retrieve_method=observation.payload.get("retrieve_method"),
         retrieve_speed=observation.payload.get("retrieve_speed"),
-        caught_at=observation.published_at,
+        caught_at=None,
         reported_at=observation.published_at or observation.first_seen_at,
         player_name=observation.payload.get("player_name"),
         source_type=SourceType.manual_import,
diff --git a/apps/api/tests/test_activity.py b/apps/api/tests/test_activity.py
index ccb32b0..bbcc2ec 100644
--- a/apps/api/tests/test_activity.py
+++ b/apps/api/tests/test_activity.py
@@ -129,3 +129,55 @@ def test_reports_without_coordinates_do_not_create_activity_group(db: Session) -
     db.commit()
 
     assert activity_rows(db, hours=72, now=NOW) == []
+
+
+def test_confidence_capped_at_50_with_single_player() -> None:
+    """D06: One player cannot artificially inflate confidence above 50%."""
+    engine = create_engine("sqlite://", connect_args={"check_same_thread": False}, poolclass=StaticPool)
+    Base.metadata.create_all(engine)
+    with Session(engine) as session:
+        waterbody = Waterbody(slug="test-lake", name_ru="Тестовое озеро", unlock_level=1)
+        fish = Fish(slug="pike", name_ru="Щука", trophy_weight_g=10_000)
+        spot = Spot(waterbody=waterbody, x=10, y=20)
+        session.add_all([waterbody, fish, spot])
+        session.flush()
+        # 10 reports from 1 player, all max confidence
+        for _ in range(10):
+            report = CatchReport(
+                fish=fish, spot=spot, waterbody=waterbody, bait=None,
+                weight_g=5_000, fishing_method="spinning",
+                caught_at=NOW - timedelta(hours=1), reported_at=NOW - timedelta(hours=1),
+                player_name="Single Player", source_type=SourceType.user,
+                source_confidence=100, moderation_status=ModerationStatus.approved,
+            )
+            session.add(report)
+        session.commit()
+        row = activity_rows(session, hours=24, now=NOW)[0]
+        assert row.unique_players == 1
+        assert row.confidence_score <= 50, f"Expected max 50 with 1 player, got {row.confidence_score}"
+
+
+def test_confidence_capped_at_65_with_two_players() -> None:
+    """D06: Two players cannot get confidence above 65%."""
+    engine = create_engine("sqlite://", connect_args={"check_same_thread": False}, poolclass=StaticPool)
+    Base.metadata.create_all(engine)
+    with Session(engine) as session:
+        waterbody = Waterbody(slug="test-lake", name_ru="Тестовое озеро", unlock_level=1)
+        fish = Fish(slug="pike", name_ru="Щука", trophy_weight_g=10_000)
+        spot = Spot(waterbody=waterbody, x=10, y=20)
+        session.add_all([waterbody, fish, spot])
+        session.flush()
+        # 10 reports from 2 players, all max confidence
+        for i in range(10):
+            report = CatchReport(
+                fish=fish, spot=spot, waterbody=waterbody, bait=None,
+                weight_g=5_000, fishing_method="spinning",
+                caught_at=NOW - timedelta(hours=1), reported_at=NOW - timedelta(hours=1),
+                player_name=f"Player {i % 2}", source_type=SourceType.user,
+                source_confidence=100, moderation_status=ModerationStatus.approved,
+            )
+            session.add(report)
+        session.commit()
+        row = activity_rows(session, hours=24, now=NOW)[0]
+        assert row.unique_players == 2
+        assert row.confidence_score <= 65, f"Expected max 65 with 2 players, got {row.confidence_score}"
diff --git a/apps/api/tests/test_community_importer.py b/apps/api/tests/test_community_importer.py
index b41e05c..805f0d9 100644
--- a/apps/api/tests/test_community_importer.py
+++ b/apps/api/tests/test_community_importer.py
@@ -116,9 +116,11 @@ def test_changed_published_record_requires_review_and_reuses_report(db: Session)
     water = Waterbody(slug="test-lake", name_ru="Тестовое озеро")
     db.add_all([fish, water])
     db.commit()
+    # D04: auto-publish now works with name match fallback
     stage_observations(db, [record() | {"weight_g": 5000}])
     item = db.scalar(select(ExternalObservation))
-    map_observation(db, item, fish, water)
+    # Item auto-published via name match fallback (D04)
+    assert item.status == "published"
     report = publish_observation(db, item)
     report_id = report.id
     stage_observations(db, [record() | {"weight_g": 6000}])