Chlorella　meal　is　considered　a　promising　alternative　to　fish　meal　in　aquafeeds,　but　the　effects　of　incorporating　Chlorella　meal　as　a　feed　ingredient　on　the　growth　and　quality　of　eel　have　not　been　explored.　The　effects　of　partially　substituting　fish　meal　(0　%,　5　%,　10　%,　15　%,　and　20　%)　with　Chlorella　meal　on　the　growth　performance,　whole-body　composition,　pigmentation,　and　physiological　health　of　marbled　eel　(Anguilla　marmorata)　were　evaluated　in　this　study.　The　results　revealed　that　dietary　inclusion　of　Chlorella　meal　significantly　increased　the　final　body　weight　(FBW),　weight　gain　rate　(WGR),　and　specific　growth　rate　(SGR),　but　it　significantly　decreased　the　feed　conversion　rate　(FCR),　with　these　parameters　exhibiting　linear　trends　(P　＜　0.05).　The　whole-body　protein　and　fat　contents　were　significantly　higher　in　all　groups　fed　with　diets　containing　Chlorella　meal　compared　to　the　control　group　(P　＜　0.05).　In　addition,　the　dorsal　and　abdominal　skin　of　marbled　eel　exhibited　an　orange-yellow　color,　and　the　color　intensity　increased　with　increasing　levels　of　dietary　Chlorella　meal.　The　color　change　corresponded　to　increased　values　of　a*　(redness),　b*　(yellowness),　and　lutein　content　in　the　fish　skin　(P　＜　0.05).　The　physiological　health　of　marbled　eel　also　improved　in　the　groups　where　Chlorella　meal　was　included.　The　optimal　replacement　rate　was　approximately　10　%　(9　%　Chlorella　meal　supplementation),　because　the　whole-body　protein　content　and　most　physiological　health　parameters　were　highest　under　this　condition,　and　the　growth　performance　did　not　show　a　significant　increase　when　the　fish　meal　replacement　rate　exceeded　10　%　(P　＞　0.05).　These　findings　indicate　the　potential　of　Chlorella　meal　as　a　promising　alternative　to　fish　meal　in　feed　formulations,　offering　benefits　in　enhancing　growth　performance　and　quality　of　marbled　eel.　©　2024　Elsevier　B.V.