The main spawning season of Dentex hypselosomus extended from November to March, and peaked from December to February in southwestern waters off Taiwan.The gonadosomatic index (GSI) of female fish is reach 1, and the stage of maturing, and more than 3 ovaries reach matured .The sizes at 50% maturity (L50) were estimated 152.5 mm FL and 165.5 mm FL for the female and male, respectively. Spawning grounds distributed in Qieding to Siaogang 150 m deep waters.
The article investigates the biology of Portunus sanguinolentus in southwestern waters off Taiwan.The carapace width of a 50% mature female reach maturity were 97 mm . The spawning season extend from February to August. The CPUE series showed that the abundance of P. sanguinolentus reach to peak in spring and summer during 2017 to 2018.