Mirrored from Sudopedia, the Free Sudoku Reference Guide
This is a fish diagram of a Franken Jellyfish:
In this example, the defining set contains rows 2 & 8 and boxes 4 & 6. The secondary set contains columns 2, 3, 7 & 8. All the candidates in the defining set (marked with X) are located inside the secondary set. The remaining candidates from these 4 columns can be eliminated.