1D Fish - that is to say, perch? (5) S_R_D. I assume that perch=rod. Both SCROD and SPROD are fish but cannot see a link to 'that is to say'. 3D Crooked discount house not unsuited to salmon production (5) C_H_S. I have come up with COHOS but do not understand it. 4D Pit bull terrier - stray one's gone (5) O_T_R. Help appreciated, thank you.