Implementation conditions in terms of the amount of load on the operator

sustainable creation of a spawning environment for masu salmon

Abstract

We examined the conditions for providing spawning habitat for masu salmon in the stream area, taking into account the physical load of the workers, and found the following. 1) the daily activity time is 6 hours, of which 3 hours are needed for development; 2) the required amount of suitable material is about 330 kg, assuming the size of the spawning ground is 2m²; 3) the number of creating the spawning ground per day is 4 sites per river, based on the past results of the use of masu salmon; 4) The following three environmental conditions are important for artificial creation. ①“Collection” is carried out in the land area adjacent to the river channel, where the suitable materials are densely deposited at least 330kg.②“Leveling” is carried out at a location where there is little digging work on the riverbed and the water depth is about 30 cm after the appropriate materials are fed into the river.③“Transport” should be carried out in a location where the route from the collection site to the development site is as landward as possible. The above conditions are important for sustainable environmental rehabilitation activities in the stream area.