AB 11:279-288 (2011)  -  DOI: https://doi.org/10.3354/ab00319

Seasonal and spatial variations in prey utilization and condition of a piscivorous flatfish Paralichthys olivaceus

Takeshi Tomiyama1,3,*, Yutaka Kurita2

1Fukushima Prefectural Fisheries Experimental Station, Iwaki, Fukushima 970-0316, Japan
2Tohoku National Fisheries Research Institute, Shiogama, Miyagi 985-0001, Japan
3Present address: Soma Branch, Fukushima Prefectural Fisheries Experimental Station, Soma 976-0022, Japan

ABSTRACT: We investigated the diet and somatic condition of 5129 individual Japanese flounder Paralichthys olivaceus, 20 to 92 cm in total length, in the Joban area along the Pacific coast of Japan (36°40’N to 38°00’N) from 2001 to 2007. Japanese flounder with food in their stomachs (1668 individuals) consumed chiefly fishes (92% of stomach contents by weight). Predominant prey species were Japanese anchovy Engraulis japonica (54% of fishes by weight) and Japanese sandlance Ammodytes personatus (22%). Japanese anchovy were consumed by Japanese flounder year round except in March and April, when the anchovy migrate from the Joban area. In March and April, Japanese flounder frequently consumed Japanese sandlance, but only in the northern part of the Joban area (37°20’N to 38°00’N); Japanese flounder did not feed on this species and had less content in their stomachs in the southern area (36°40’N to 37°20’N), where the sandlance is absent. Somatic and hepatosomatic conditions of Japanese flounder in the northern area were better than those in the southern area in March and April, suggesting that such spatial and seasonal heterogeneities in prey availability affect the nutritional status of predators.


KEY WORDS: Spatio-temporal variability · Prey availability · Body condition · Piscivory · Flounder · Generalized linear mixed models


Full text in pdf format 
Cite this article as: Tomiyama T, Kurita Y (2011) Seasonal and spatial variations in prey utilization and condition of a piscivorous flatfish Paralichthys olivaceus. Aquat Biol 11:279-288. https://doi.org/10.3354/ab00319

Export citation
Mail this link - Contents Mailing Lists - RSS
- -