Try using coordinates relative to the fish instead of absolute coordinates.
DEF SPICHK
DCHK=BGGET(2,X,Y+7,1)
UCHK=BGGET(2,X,Y-7,1)
LCHK=BGGET(2,X-7,Y,1)
RCHK=BGGET(2,X+7,Y,1)
IF DCHK==128 || UCHK==128 || LCHK==128 || RCHK==128 THEN HIT 1
END
X and Y are your fish's X and Y coordinates.
0そうだね プレイ済み