Narrow-banded Spanish Mackerel

They are vivid blue to dark grey in colour along their backs and flanks and fade to a silvery blue-grey on the belly. Spanish mackerel have scores of narrow, vertical lines down their sides. Spanish mackerel grow to about 200 cm and up to 70 kg. They are the largest of all Australian mackerels.

Scomberomorus commerson is found in a wide area centering in Southeast Asia, but as far west as the east coast of Africa and from the Persian Gulf and along the northern coastal areas of the Indian Ocean, and as far east as Fiji in the South West Pacific ocean. The species is common down both sides of Australia as far south as Perth on the west coast and Sydney on the east coast. It is also found as far north as China and even Japan. Recorded first in the Mediterranean Sea in 1935 off Mandatory Palestine, it is now very common in the eastern Levant where it has become an important target species for local fisheries.

Spanish mackerel spawn in oceanic conditions on reef edges. Eggs have a large oil droplet that aids in buoyancy and keeps them at the top of the water column which is warmer, well oxygenated, and has an abundant planktonic food supply for the larvae once they are hatched. When in the larval stage, Spanish mackerel are believed to stay in their own species-specific groups and are not normally found with other species of the same genus, such as S. semifasciatus and S. queenslandicus. This is not always the case with adult mackerel, where occasional mixing of different species within the same genus can occur. Spawning is seasonal, but it is protracted in the warmer waters of the tropics. Many of the fisheries that target this species are based on prespawning feeding aggregations. A significant proportion of the female fish caught in Northern Territory waters between July and December have either recently spawned or are close to spawning. In general, spawning times for Spanish mackerel tend to be associated with higher water temperatures that promote optimal food availability for the rapid growth and development of the larvae. As the young larvae grow, they move from the offshore spawning grounds to inshore and estuarine habitats, where they are frequently found in the juvenile phase of their growth cycle. …

In 2023 the Taiwanese Fisheries Research Institute succeeded in artificially breeding narrow-barred Spanish mackerel.