Fysshes that ben of small substaunce, & thynne skynnes, easy of eatynge, bredde in rennynge waters nyghe the see ben better & lyghter than they that bredde in the see or fresshe ryvers. But fysshe that bredeth in the see is holsomer than fresshe ryver fysshe. Therfore beware of fysshe of grete substaunce with harde skynnes for suche ben comynly venemous.