piscatorial (adj.)

"pertaining to fishing or fishermen," 1630s, from Latin piscatorius "of fishermen," from piscator "fisherman," from piscari "to fish," from pisces "a fish," from PIE root *pisk- "a fish."

adjectival word-forming element, variant of -al (1) with connective -i-. From Latin -ialis, in which the -i- originally was from the stem of the word being attached but later came to be felt as connective.