RRC ID 70491
著者 Kenzaki A, Okunishi S, Tomoda T, Shioura Y, Uchida M, Tezuka N, Maeda H.
タイトル Observation of the feeding behaviour of reared Japanese eel Anguilla japonica leptocephali fed picocyanobacteria Synechococcus spp.
ジャーナル J Fish Biol
Abstract The authors observed the feeding behaviour of artificially reared Japanese eel Anguilla japonica leptocephali, 7.5-19 mm total length (10-61 days post-hatch), fed Synechococcus sp., which is considered a potential food source of anguilliform larvae. Three strains of Synechococcus sp. (NIES-972, 976 and 979) were tested as the food material. Larvae across the entire length range could effectively ingest a suspension of pico-sized cyanobacteria (1-3 μm in diameter). Video observations of the mid-hindgut of larvae under an epifluorescence microscope confirmed that the movement of microvilli of the intestinal epithelium allowed the cell particles to circulate in the mid-hindgut, before becoming solidified in the anal region. Significant differences in food intake were observed between larvae fed two strains of Synechococcus (NIES-972 and 976), and among different cell densities, which suggests feeding selectivity and density dependence. Comparisons of feeding behaviour under the light group (9L:15D) and the dark group (24D) showed significantly higher food intake (measured as an index of intestinal fullness) in the light group, although substantial and continuous ingestion was observed in the dark group, indicating continuous feeding by swallowing sea water. The authors hypothesise that the feeding ecology of anguilliform leptocephali is based on a survival strategy whereby the larvae do not compete with various higher-trophic-level fishes for food in an oligotrophic environment.
巻・号 100(3)
ページ 727-737
公開日 2022-3-1
DOI 10.1111/jfb.14986
PMID 34958491
MeSH Anguilla* Animals Feeding Behavior Larva Synechococcus*
IF 1.497
リソース情報
藻類 NIES-972 NIES-976 NIES-979