However , there are many divergent opinions against the theory that monster crows mean cormorant , and even if it meant cormorant , yellow fish were considered as sturgeon so , that it is difficult to think that a cormorant swallows such big fish like a sturgeon ; therefore , the theory that this poem is an evidence of Ukai remains in doubt .
また 、 出自 に つ い て も 諸説 あ り 定か で は な い 。KFTT KFTT