Reproductive ecology of the glowbelly, Acropoma japonicum (Perciformes: Acropomatidae) in the coastal waters off Gori, Korea

Abstract

The reproductive ecology of the glowbelly, Acropoma japonicum was examined using 637 specimens collected monthly from January to December 2006 in the coastal waters off Gori, Korea. The specimens ranged in standard length (cm, SL) from 2.9 to 11.4cm for female, 2.7 to 10.5cm for male. The gonadosomatic index (GSI) of female was highest in September and decreased until December, and the spawning season lasted from August to November. The monthly sex was not different significantly (x 2 -test, p＞0.05). The size at 50% maturity was estimated at 6.0cm SL. A. japonicum was multiple spawner that spawn on more than one occasion in a single spawning season, and the maximum egg diameter was

Ontogenetic and seasonal changes in the diets of the glowbelly Acropoma japonicum Gunther, 1859 in the south-eastern waters of Korea

“…To infer whether there were any size-related and seasonal variation in the dietary composition, samples were divided into two length classes and four seasons. For size-related analysis, samples were divided into two groups (small and large length classes) based on their size at maturity, i.e., 6.0 cm SL (Baeck et al, 2012). Thus, for the analyses, the length classes were defined as small (3.0-5.9 cm SL, n=104) and large (6.0-10.3 cm SL, n=76); the seasons as spring (March-May, n=70), summer (June-August, n=12), autumn (September-November, n=58) and winter (December-February, n=40).…”

“…Just a few studies have described its life history (Okuda et al, 2005), reproduction (Baeck et al, 2012) and morphological features (Javadzadeh et al, 2012) and a single paper described the diet and isotopic signatures of A. japonicum in the Uwa Sea, Japan (Hamaoka et al, 2010). There is, no targeted study on how feeding may change with increasing body size and season in south-eastern Korea.…”