\u00c9tude exp\u00e9rimentale de la pr\u00e9dation de la palourde japonaise,
\nRuditapes philippinarum., par la dorade royale,
\nSparus aurata, et le baliste, Balistes capriscus
\nAbstract
\nR\u00e9sum\u00e9
\nRen\u00e9 Robert (1) et Ren\u00e9 Parra (2)
\n(1) IF’REjlER, quai du commandant Silhouette, 33120 Arcachon. FraI\/Cf.
\n(2) lnj\/\u00celut t:l\/iursilairr de Bio!oy,ir .11arine, 2 rue du Pro\/mmr ]\/J[yel, 33120 ArWc!WIl, France.
\nRe\u00e7u le 17 dC’C’cmbrc 1 rJ!)o; accept\u00e9 le fi mai 1991.
\nExperimental study of predation by the gilthead bream, Sparus aurata and the gray triggerfish, Balistes
\ncapriseus on the ManiJa clam Rue\/irapes philippinarum.
\nRohert R., R. Parra. Aquat. Ut’\u00ceng Resour., 1991,4. 181-189.
\nSince 1988, heavy mortality of reared Manila clam Ruditapes philippinarurn have heen observed in
\nthe basin of Arcachon. Clam predation by the gilthead bream Sparus aurata and the gray triggerfish
\nBalistes capriscus has been suspected. Thcrefore, an experimental study of predation on Ihis dam by
\nthese two fish has been carried out. Feeding rates were determined according to the size of clams,
\ntemperature and degree of protection. The amount of clams ingested varied with the size of predator
\nand prey but bath fish were serious clam predator. A daily ingestion of 500 sccd and 350 spa! has
\nbeen recorded, 50 to 70% of the prey being eaten during the first 6 hours. Beeause clams were
\ngenerally communited by thcse two fish and bottom marks quite similar, it was not possible ta
\ndiseriminate the intervention ofboth predators. When water temperature was below 16’C, an important
\ndecrease in the feeding activity was observed. A net protection may be used to prevent this kind of
\npredation. The Manila clam mortalities, recorded during the summer period in the basin of Arcachon,
\nean be attributed, to a certain extend, to the intervention of these fish. Sparus aura ta is a clam
\npredator but the occurrence of the gray triggerfish Balistes capriscus in the basin of Arcachon is a
\nserious concern because this is a vigorous species which \u00ces not commercialy fished and then out of
\ncontrol.
\nKeywords : Sparus aurata, Balistes capriscus, Ruditapes philippinarum, Manila clam, predation<\/p>\n","protected":false},"excerpt":{"rendered":"
\u00c9tude exp\u00e9rimentale de la pr\u00e9dation de la palourde japonaise, Ruditapes philippinarum., par la dorade royale, Sparus aurata, et le baliste, Balistes capriscus Abstract R\u00e9sum\u00e9 Ren\u00e9 Robert (1) et Ren\u00e9 Parra…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[2],"tags":[],"class_list":{"0":"post-561","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-etudes"},"acf":[],"yoast_head":"\n