“…It has been shown that, in sea bass muscle, they are differently expressed depending on the season of the year (Ladrat, Chaplet, Verrez-Bagnis, Noël & Fleurence, 2000). On the other hand, cathepsins B, D, L and H are the major cathepsins within the fish lysosomes (Aoki, Yamashita & Ueno, 2000) ; some of them have been studied for their enzymatic features (Lee, Chen & Jiang, 1993 ;Jiang, Lee & Chen, 1994 ;Goldman-Levkovitz, Rimon & Rimon, 1995 ;Heu, Kim, Cho, Godber & Pyeun, 1997) and for their ability to degrade muscle proteins (Jiang, Wang & Chen, 1992 ;Aoki & Ueno, 1997 ;Aranishi, Ogata, Hara, Osatomi & Ishihara, 1998). It would be expected that the respective action of each protease is possibly affected by the other proteases.…”