Trend of ice goby spawning habitat in the brackish area of the Muromi River

Abstract

 This study attempted to evaluate changes in the spawning habitat of ice goby in the brackish waters of the Muromi River over the past 10 years, based on spawning conditions obtained from field surveys and changes in spawning fitness determined by a generalized linear model. Although the number of spawning sites and plots were in a decreasing trend, the area around the pier of the Muromi New Bridge and the area where spawning grounds were constructed consistently functioned as the main spawning habitat. Although changes in the shape of the sandbars were observed, the spawning area did not change significantly in the 500 m downstream of the weir. However, in recent years, spawning sites have been limited to areas with