diff --git a/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/applications/ports/DatasetsRepository.java b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/applications/ports/DatasetsRepository.java
index 28175aa..54648ec 100644
--- a/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/applications/ports/DatasetsRepository.java
+++ b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/applications/ports/DatasetsRepository.java
@@ -11,6 +11,7 @@
 public interface DatasetsRepository {
 
     List<SearchedDataset> search(List<String> datasetIds,
+            String returnFields,
             String sort,
             Integer rows,
             Integer start,
diff --git a/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/config/CkanConfiguration.java b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/config/CkanConfiguration.java
new file mode 100644
index 0000000..f6347bb
--- /dev/null
+++ b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/config/CkanConfiguration.java
@@ -0,0 +1,8 @@
+package io.github.genomicdatainfrastructure.discovery.datasets.infra.ckan.config;
+
+public class CkanConfiguration {
+   public static final String CKAN_IDENTIFIER_FIELD = "identifier";
+   public static final String CKAN_FACET_GROUP = "ckan";
+   public static final String CKAN_FACET_LABEL = "DCAT-AP";
+   public static final String SELECTED_FACETS = "[\"access_rights\",\"theme\",\"tags\",\"spatial_uri\",\"organization\",\"publisher_name\",\"res_format\"]";
+}
diff --git a/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanDatasetIdsCollector.java b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanDatasetIdsCollector.java
index e528c40..87f1f7f 100644
--- a/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanDatasetIdsCollector.java
+++ b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanDatasetIdsCollector.java
@@ -15,6 +15,8 @@
 
 import java.util.List;
 
+import static io.github.genomicdatainfrastructure.discovery.datasets.infra.ckan.config.CkanConfiguration.CKAN_IDENTIFIER_FIELD;
+
 @ApplicationScoped
 public class CkanDatasetIdsCollector implements DatasetIdsCollector {
 
@@ -34,10 +36,11 @@ public List<String> collect(DatasetSearchQuery query, String accessToken) {
         var response = ckanQueryApi.packageSearch(
                 query.getQuery(),
                 facetsQuery,
-                null,
-                null,
-                null,
-                null,
+                CKAN_IDENTIFIER_FIELD,
+                "",
+                1000,
+                0,
+                "",
                 accessToken
         );
 
diff --git a/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanDatasetsRepository.java b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanDatasetsRepository.java
index f742932..7b089cc 100644
--- a/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanDatasetsRepository.java
+++ b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanDatasetsRepository.java
@@ -23,13 +23,13 @@
 import java.util.List;
 import java.util.Objects;
 
+import static io.github.genomicdatainfrastructure.discovery.datasets.infra.ckan.config.CkanConfiguration.CKAN_FACET_GROUP;
+import static io.github.genomicdatainfrastructure.discovery.datasets.infra.ckan.config.CkanConfiguration.CKAN_IDENTIFIER_FIELD;
 import static java.util.Optional.ofNullable;
 
 @ApplicationScoped
 public class CkanDatasetsRepository implements DatasetsRepository {
 
-    private static final String CKAN_IDENTIFIER_FIELD = "identifier";
-    private static final String CKAN_FACET_GROUP = "ckan";
     private static final DateTimeFormatter DATE_FORMATTER = DateTimeFormatter.ofPattern(
             "yyyy-MM-dd'T'HH:mm:ss.SSSSSS"
     );
@@ -45,6 +45,7 @@ public CkanDatasetsRepository(
 
     @Override
     public List<SearchedDataset> search(List<String> datasetIds,
+            String returnFields,
             String sort,
             Integer rows,
             Integer start,
@@ -72,10 +73,11 @@ public List<SearchedDataset> search(List<String> datasetIds,
         var response = ckanQueryApi.packageSearch(
                 "",
                 facetsQuery,
+                returnFields,
                 sort,
                 rows,
                 start,
-                null,
+                "",
                 accessToken
         );
 
diff --git a/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanFacetsBuilder.java b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanFacetsBuilder.java
index 190a818..f452612 100644
--- a/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanFacetsBuilder.java
+++ b/src/main/java/io/github/genomicdatainfrastructure/discovery/datasets/infra/ckan/persistence/CkanFacetsBuilder.java
@@ -15,13 +15,12 @@
 import java.util.List;
 import java.util.Map;
 
+import static io.github.genomicdatainfrastructure.discovery.datasets.infra.ckan.config.CkanConfiguration.*;
 import static java.util.Optional.ofNullable;
 
 @ApplicationScoped
 public class CkanFacetsBuilder implements FacetsBuilder {
 
-    private static final String CKAN_FACET_GROUP = "ckan";
-    private static final String SELECTED_FACETS = "[\"access_rights\",\"theme\",\"tags\",\"spatial_uri\",\"organization\",\"publisher_name\",\"res_format\"]";
 
     private final CkanQueryApi ckanQueryApi;
 
@@ -36,9 +35,10 @@ public FacetGroup build(DatasetSearchQuery query, String accessToken) {
         var response = ckanQueryApi.packageSearch(
                 query.getQuery(),
                 facetsQuery,
+                query.getFl(),
                 query.getSort(),
                 0,
-                0,
+                query.getStart(),
                 SELECTED_FACETS,
                 accessToken
         );
@@ -53,7 +53,7 @@ public FacetGroup build(DatasetSearchQuery query, String accessToken) {
     private FacetGroup facetGroup(Map<String, CkanFacet> facets) {
         return FacetGroup.builder()
                 .key(CKAN_FACET_GROUP)
-                .label("DCAT-AP")
+                .label(CKAN_FACET_LABEL)
                 .facets(facets.entrySet().stream()
                         .map(this::facet)
                         .toList())
diff --git a/src/main/openapi/ckan.yaml b/src/main/openapi/ckan.yaml
index ac47439..0ad383b 100644
--- a/src/main/openapi/ckan.yaml
+++ b/src/main/openapi/ckan.yaml
@@ -30,6 +30,12 @@ paths:
           required: false
           schema:
             type: string
+        - name: fl
+          in: query
+          description: dataset fields to be returned
+          required: false
+          schema:
+            type: string
         - name: sort
           in: query
           description: Sorting of search results
diff --git a/src/main/openapi/discovery.yaml b/src/main/openapi/discovery.yaml
index 2643d2c..12a0421 100644
--- a/src/main/openapi/discovery.yaml
+++ b/src/main/openapi/discovery.yaml
@@ -166,6 +166,10 @@ components:
           title: Facets
           items:
             $ref: "#/components/schemas/DatasetSearchQueryFacet"
+        returnFields:
+          type: string
+          title: dataset fields to return
+          default: "*"
         sort:
           type: string
           title: Sorting of search results