Eggs, Larvae and Juveniles of the Fishes Occurring in the Nagara River Estuary, Central Japan.
|
Accession number;00A0559776
|
| Title;Eggs, Larvae and Juveniles of the Fishes Occurring in the Nagara River Estuary, Central Japan. |
| Author;
KIMURA S
(Mie Univ., Mie, Jpn)
OKADA M
(Mie Univ., Mie, Jpn)
YAMASITA T
(Mie Univ., Mie, Jpn)
TANIYAMA I
(Mie Univ., Mie, Jpn)
YODO T
(Mie Univ., Mie, Jpn)
HIROSE M
(Mie Univ., Mie, Jpn)
SADO T
(Mie Univ., Mie, Jpn)
KIMURA F
(Mie Univ., Mie, Jpn)
|
Journal Title;Bull Fac Bioresour Mie Univ
|
Journal Code:Y0251B
|
ISSN:0915-0471
|
|
VOL.;NO.23;PAGE.37-62(1999)
|
| Figure&Table&Reference;FIG.18, TBL.7, REF.32 |
| Pub. Country;Japan |
| Language;English |
| Abstract;The larval and juvenile fish fauna in the Nagara River estuary, central Japan, was surveyed during the period from July 1994 to April 1997, and the effects of the recently-completed estuary dam were considered. A total of 4,771 fish eggs collected represented 11 taxa, being mainly coastal marine species. Larvae and juvenile fishes collected totaled 17,848 representing 27 families and 37 species, including brackish, diadromous migratory and coastal marine forms. The lower Nagara River estuary, below the dam, played an important role as spawning and nursery grounds for some marine fishes, which the dam did not directly effect. The larval fish fauna in the upper Nagara River estuary, above the dam, was less diverse than that in the lower estuary, with some upper estuarine marine and brackish-water species disappearing after the closure of the dam gates. Catadromous Plecoglossus altivelis altivelis larvae, usually dominant in the lower reaches of the Nagara River in November, became trapped in the dam backwater after the dam gates were closed, a large proportion of the larvae overall thus being unable to migrate normally to the lower estuarine area. Before the dam gates were closed, Salangichthys microdon was distributed widely throughout the Nagara River estuary, its spawning ground apparently being located in the upper estuary. Following the closure of the gates, the spawning and nursery grounds were destroyed and the species completely disappeared from the lower reaches of the Nagara River. The dam apparently did not affect catadromous Cottus reinii larvae, although it influenced on the anadromous juveniles when they passed over it. (author abst.) |
|
|
|
Related Articles;
|
|
