caa a22 4500 477116434 CHVBK 20180405111623.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00002384 doi (NATIONALLICENCE)springer-10.1007/BF00002384 Maldeniya Rekha National Aquatic Resources Agency, Crow Island, Mattakkuliya, 15, Colombo, Sri Lanka aut Food consumption of yellowfin tuna, Thunnus albacares , in Sri Lankan waters [Elektronische Daten] [Rekha Maldeniya] Synopsis: A total of 4181 stomachs of yellowfin tuna,Thunnus albacares (22-164 cm FL), mainly caught by gillnets in the period from July 1984 to June 1986 were analyzed. Food consumption of yellowfin tuna in nature was determined using the values of the average stomach content, incorporating laboratory measurements of gastric evacuation rates in a feeding model. The diet of yellowfin tuna around Sri Lanka comprised a variety of macro zooplanktonic and nektonic organisms. Juveniles < 39 cm FL, are planktivores. Tuna > 40 cm FL gradually increase their consumption of fishes with increasing size. Among fish speciesAuxis sp. are the most important. The daily food consumption of juvenile yellowfin tuna (22-59 cm FL) range from 1.8 g to 136.2 g, increasing to about 284.7 g to 551.9 g for the medium size tuna (60-99 cm FL). The adult tuna (100->130 em FL) consume around 513 g to 538.8 g of prey per day. Daily ration estimates increase from 2.1% to 5.5% of body weight with increasing size up to 70 cm FL, beyond which it decreases. The predatory pressure of yellowfin tuna on commercially important fishes and other species is discussed. Kluwer Academic Publishers, 1996 Food composition nationallicence Daily diet nationallicence Fish nationallicence Scombrid nationallicence Coastal environment nationallicence Environmental Biology of Fishes Kluwer Academic Publishers; http://www.wkap.nl 47/1(1996-09-01), 101-107 0378-1909 47:1<101 1996 47 10641 https://doi.org/10.1007/BF00002384 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00002384 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Maldeniya Rekha National Aquatic Resources Agency, Crow Island, Mattakkuliya, 15, Colombo, Sri Lanka aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers; http://www.wkap.nl/ 47/1(1996-09-01), 101-107 0378-1909 47:1<101 1996 47 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer