ARTIFICIAL SPAWNING SUBSTRATE FUNCTIONING AS SPAWNING GROUND FOR FISHES AND METHOD FOR INSTALLING ARTIFICIAL SPAWNING SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To solve such problems that conventional spawning of fishes including Arctoscopus japonicus has extremely strong selectivity with few examples of spawning on artificial materials and the amount of thick growing of natural seaweeds has a great yearly fluctuation to resultantly greatly fluctuate the amount of spawning, etc., though lumps of spawns are laid in a branched forked part as the center of Cystoseira hakodatensis Fensholt, species of Sargassum fulvellum C. Agardh, etc., in the conventional spawning of the fishes. SOLUTION: This artificial spawning substrate is capable of providing a spawning substrate even in a sea area where natural seaweeds such as Cystoseira hakodatensis Fensholt or species of Sargassum fulvellum C. Agardh do not adhere without yearly fluctuation so as to stably carry out the spawning of the fishes. The method for installing the artificial spawning substrate is provided.