Possible Clues:

• Tiny fish
• Fish spawn covers river
• Slight quarrel about head of rudd (a fish)
• Either of a nursery rhyme couple
• Jack who’s a picky eater
• Small, oily fish
• Took a seat to eat pork, oddly, and fish
• Jack, a lover of lean little fish
• No-fat eater Jack of rhyme
• Minor argument about head of rotten fish