Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to determine the sex of a fish [title] Look for a nuchal hump on male fish. [step] A nuchal hump is a small bump on the forehead of a fish. The presence of one can be taken as confirmation that a fish is male.

Ending1: As a result, look carefully to see if a specific fish has or doesn't have a nuchal hump. [substeps] Many species of fish won't have a nuchal hump, and if they do, it might not be apparent. Ending2: This is a good sign of omega 3's. Omega 3's are one of the hallmarks of freshwater fish. Ending3: Some males' bodies are more erect than others, but to discern a male from a female fish, look for a hump on top of the head. [substeps] Nuchal hump may be a sign of either male or female sex. Ending4: [substeps] Males are marked by a reddish hump which forms around the head. If the hump is black, straight lines cross over the head in a figure eight pattern.

Answer format: ending1/ending2/ending3/ending4