title: Changes in growth and reproductive traits of dragonet Callionymus valenciennei in Tokyo Bay, concurrent with decrease in stock size.
abstract: We examined changes in the growth and reproductive traits of dragonet Callionymus valenciennei concurrent with decrease in stock size in Tokyo Bay. Stock size in mid 2000s decreased to 14% of that recorded in early 1990s. The minimum standard length at which dragonet attain gonadal maturation was smaller in 2000s (4.8 cm) compared to that in 1990s (6.0 cm). In addition, timing of the onset of the first spawning became earlier in 2000s (starting from spring) than that in 1990s (from summer). We also found significant changes in growth for both sexes from 1990s to 2000s; growth of dragonet after they attained sexual maturation showed a significant decrease in 2000s against that in 1990s. Changes in the life history traits may reflect trade-off for allocating available energy resource to reproduction rather than to somatic growth under limited prey abundance for enhancing a chance for stock recovery. However, these changes in the life history traits might have not led to the resilience of the population due to negative effects of hypoxia on settlement of larvae from the spring spawning season.
authors.affiliation: Center for Environmental Risk Research, National Institute for Environmental Studies, Onogawa, Tsukuba, Ibaraki 305-8506, Japan. Electronic address: kodama.keita@nies.go.jp.
authors.forename: Keita
authors.initials: K
authors.lastname: Kodama
authors.affiliation: Center for Environmental Risk Research, National Institute for Environmental Studies, Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Jeong-Hoon
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Center for Environmental Risk Research, National Institute for Environmental Studies, Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Shiraishi
authors.affiliation: Center for Environmental Risk Research, National Institute for Environmental Studies, Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Horiguchi
mesh_terms: D000818:Animals; D061006:Bays; D049628:Body Size; D005260:Female; D005399:Fishes / Q000502:physiology*; D007564:Japan; D008297:Male; D010053:Ovary / Q000254:growth & development; D011156:Population Density; D012098:Reproduction
keywords: Density-dependent; Dragonet; Growth; Hypoxia; Life history trait; Macrobenthos; Reproduction; Tokyo Bay; Water temperature