Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Munehico Iwata"'
Publikováno v:
Journal of Fish Biology. 100:1195-1204
The life history and reproductive ecology of an autumn-spawning bitterling Acheilognathus typus were studied under natural and experimental conditions. In the study pond, the embryos of A. typus emerged from mussels in May and grew rapidly until Augu
Autor:
Takaomi Arai, Hiroaki Chiba, Keishi Kinoshita, Tatsuki Yoshinaga, Koushou Iguma, Munehico Iwata, Tsutomu Kurosawa, Shunsuke Moriyama, Daisuke Ojima
Publikováno v:
Aquaculture. :101-108
Chum salmon (Oncorhynchus keta) fry were reared in freshwater (FW), mimicking the hatchery enhancement program, and in seawater (SW) to determine the effect on growth. The fry groups in SW showed exponential growth, whereas those in FW grew in a line
Publikováno v:
Journal of Freshwater Ecology. 23:341-346
The spawning seasons and distributions of sympatric sculpins, namely, the small egg-type (SE) of Cottus pollux and C. hangiongensis, were investigated in a coastal river of northeastern Japan. The spawning seasons for both species last for four month
Publikováno v:
Aquaculture. 273:227-234
The present study was undertaken to investigate endocrine and osmoregulatory changes during the parr–smolt transformation of anadromous Arctic charr ( Salvelinus alpinus ). One year old, first generation hatchery-reared offspring of wild anadromous
Autor:
Daisuke Ojima, Munehico Iwata
Publikováno v:
Aquaculture. 273:185-193
Downstream migration in chum salmon fry was initiated soon after the gate of a hatchery raceway was opened. The relationship between the onset of downstream movement and thyroxine (T 4 ) surge was investigated. In experiment 1, the gates of the racew
Autor:
Munehico Iwata, Daisuke Ojima
Publikováno v:
Aquaculture. 273:329-336
Growth-accelerated yearling coho salmon smolts, weighing approximately 200 g, were collected in spring and cannulated via the dorsal aorta; they were held individually in containers during the process. A cannula was connected outside the container wi
Publikováno v:
Environmental Biology of Fishes. 81:185-194
We investigated the influence of human activities on the spawning migration of the mud loach, Misgurnus anguillicaudatus. Mud loaches migrate from rivers to paddy fields for spawning. In this study, the number of adult loaches in paddy fields showed
Autor:
Munehico Iwata, Yasufumi Fujimoto
Publikováno v:
Fisheries Science. 71:1019-1028
The effects of light intensity on the use of cover by Japanese dace, Tribolodon hakonensis, under natural and experimental conditions were examined. Concrete blocks were placed to provide cover in a study pool and the numbers of dace in open water an
Autor:
Yasuo Sakuma, Ishwar S. Parhar, Munehico Iwata, Satoshi Ogawa, Masato Matushita, Hiroshi Uchida, Mina Harada
Publikováno v:
Journal of Neurobiology. 65:1-11
Direct olfactory inputs to any of the known gonadotropin-releasing hormone (GnRH) containing neurons have not been demonstrated. Therefore, the rationale of this study was to examine whether olfactory inputs might in some way interact with the GnRH s
Autor:
Hiroaki Chiba, Koichi Okuzawa, Kunio Yamamori, Hideaki Yamada, Takeshi Yamanome, Yasufumi Fujimoto, Munehico Iwata, Masafumi Amano, D. Ojima
Publikováno v:
Fish Physiology and Biochemistry. 30:267-273
Effects of gonadotropin-releasing hormone (GnRH) on thyroxine (T4) release in vivo and in vitro were studied in barfin flounder Verasper moseri, masu salmon Oncorhynchus masou and goldfish Carassius auratus. Seabream GnRH (sbGnRH) at a dose of 200 ng