Traceable Species

Onaga (Ruby Snapper)

‘Ula‘ula koa‘e, Long-tail Red Snapper, Scarlet Snapper, Onaga or Hamadai (Sushi)

Onaga (Ruby Snapper)

Onaga, or Ruby Snapper, is named after its bright red appearance and has large eyes that allow it to live in the deep sea. It is better known by its Japanese name than Hawaiian name, ‘Ula‘ula koa‘e, which roughly translate as “the red fish with the tail of the Koa‘e bird”. It is one of Hawai’I’s “deep seven” bottomfish species, and ranges from the Indian to Pacific Ocean. Onaga inhabits rocky bottoms of continental shelves and slopes between 600 and 1,000 feet deep. It grows up to 30 pounds and 3 feet.

Onaga have a vivid scarlet color and a long slender tail whose tips may be red or black. The fish’s iris is usually a brilliant red as well. This long-lived species is often served raw as sashimi. In Japanese culture, having Onaga during weddings and New Year’s represents good luck, due to its red color.

Onaga (Ruby Snapper)

Onaga take a relatively long time to mature. They reach sexual maturity once they grow between 23 and 35 inches in length, or four years of age. Female Onaga begin maturing in June, with fully ripe eggs in July. Peak spawning activity for does not happen until October, lasting about a month. This is most likely due to increases in water temperature and length of day. Their pelagic eggs hatch 17 to 36 hours after spawning.

Food Info Onaga (Ruby Snapper)


  • Color: clear, light pink flesh  
  • Texture: soft and moist with firm flesh
  • Flavor: delicate, mild sweet flavor
  • Perfect serve: Onaga is most commonly served raw, baked, steamed or sauteed. It also makes great sashimi.
Species Range
Onaga (Ruby Snapper) range Source:
‘Ula‘ula koa‘e
Long-tail Red Snapper
Scarlet Snapper
Onaga or Hamadai (Sushi)
Hawaiian Bottomfish by Rod & Reel Sep 01 - Aug 31
These crabs mate at the time of maturity, which is approximately 3 years of age. Females are smaller than males; this is because the development of reproductive tissues required more energy for females, leaving less energy available for continued body growth. They grow through a process known as molting—regularly shedding their shell and growing a new, larger one. They continue to molt and grow after they have reached sexual maturity. During the breeding season, the crabs leave their borrows in a phenomenon characterized by mass mate-searching events. Once mating/fertilization has occurred, females spawns in the water. The larvae released during the rainy season develop in offshore waters and return to coastal waters five to eight weeks after larval release.
Mangrove crabs are important fishery resources in all Brazilian coast, mainly in the north and northeast where many fishermen depend upon their catch. In addition to its social and economic importance, the mangrove crab is a “keystone” species in ecosystem, they playing an important role in the processes of nutrient cycling and energy transfer.

Fishing Methods

{'fisheries': [<License: Hawaiian Bottomfish by Rod & Reel>], 'gear': <Gear: Deep-sea Rod & Reel>}

Deep-sea Rod & Reel

This fishery uses rods and reels to catch six species of snapper and one species of grouper that are called “bottomfish.”


Featured Harvester Bernie Berry

Mangrove Crab Harvester

Canavieiras, Brazil

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