Blue mackerel

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Blue mackerel
Scaus u0.gif
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Perciformes
Family: Scombridae
Tribe: Scombrini
Genus: Scomber
Species: S. australasicus
Binomial name
Scomber australasicus
Cuvier, 1832

The blue mackerel, Japanese mackerel, Pacific mackerel, slimy mackerel, or spotted chub mackerel, Scomber australasicus, a fish of the family Scombridae, is found in tropical and subtropical waters of the Pacific Ocean from Japan south to Australia and New Zealand, in Eastern Pacific (Hawaii and Socorro Island (Mexico), also in the Indo-West Pacific: the Red Sea, the Persian Gulf, the Gulf of Oman and the Gulf of Aden, in surface waters down to 200 m (660 ft). In Japanese, it is known as goma saba (胡麻鯖 sesame mackerel). Its length is between 30 cm and 65 cm (12 in and 25 in), and weighs a little over a kilogram (2 lbs).

Characteristics[edit]

Blue mackerel are often mistaken for chub mackerel. In fact, blue mackerel were believed to be a subspecies of chub mackerel until the late 1980’s. Even though they are both in the same family (scomber), blue mackerel set themselves apart by differing structural genes than those of the chub mackerel.[1] Other, more obvious, characteristics set these two apart, like the longer anal spine of the blue mackerel, and the amount of the first dorsal spines.[1] Mackerels have a round body that narrows into the tail after the second dorsal fin, similar to a tuna fish.[2] The Blue mackerel is known as a voracious and indiscriminate feeder, they will devour microscopic plankton and krill, live anchovy, engulf dead cut bait, and strike readily on lures and other flies. When in a school and in a feeding frenzy, they will strike at non-food items such as cigarette butts and even bare hooks. While relatively small in size, pound for pound mackerel score high for their fighting ability. Blue mackerels are carnivores, eating smaller fish in their same region of the upper layer of the ocean, also called the pelagic zone. Due to their eating habits and their diurnal lifestyles, blue mackerels have adapted a higher sensitivity in their retinas, allowing better eyesight even during the night to catch their prey. Another adaptation of blue mackerels is their eye size. They typically have larger eyes than herbivores in their same region.[3]

Habitat[edit]

Throughout the life of a mackerel, they tend to stay in areas that are within a few degrees of 10 C.[4] This species typically stays in tropical to subtropical waters.[1] Off the east coast of North America, populations of mackerel have grown to over two million after being depleted in 1982.[4] Blue mackerels can be found anywhere from the coast of North America, and as far as Australia and Japan.

Life Span[edit]

Incubation periods range from three to eight days. Periods are shorter when the temperature is higher, and longer when the temperature is lower.[4] In the East China Sea, blue mackerels spawn between February and May, when the water temperatures are ideal.[5] In New South Whales, most spawning occurs 10 nanometers off of the northern shore, in waters that are 100 to 125 meters deep. The Eastern Australian Current can carry eggs and larvae away from the original spawning grounds, broadening the area in which blue mackerels are located. However, egg and larvae probability of surviving decreases the further they are carried by the Eastern Australian Current.[6] A mature blue mackerel is considered to be over 310 millimeters.[5] Mackerels can live up to seven years and grow to be up to 50 cm, but are most commonly found to be between one and three years of age.[7][8] Counting the marks on otoliths determines the age of blue mackerels.[8]

Fishing[edit]

The blue mackerel can be flighty and difficult to catch, especially in estuaries and harbors. 300 to 500 million tons of blue mackerel have been caught annually since the mid 1980s, without many fluctuations from month to month catches. Blue mackerels are caught for both commercial and private use. They are caught for consumption as well as bait for tuna and other fishing expeditions.[9]

As food[edit]

While Mackerel are often used as sushi "Saba", they are a strong tasting meat which is best for consumption if smoked, barbecued, or boiled.The Pacific Blue mackerel whilst easy to fillet and skin can be difficult to debone and care must be taken not to damage the soft flesh. Due to the care needed to skin the blue mackerel, the fish is known to be fastidious to clean, dress, and prepare for consumption. In light of this, simply taking fillets from the body and cooking with the skin and small bones on can be the best method for making them into a meal. Blue mackerel have a dark red meat.[7] Blue mackerel are utilized as meat binders as well as main meat entrees. After being freeze-dried, the protein is extractable and put into other meat products to keep the meat and seasonings tightly together. By using mackerel to bind the meat, cheaper and more appealing products are available to consumers. Not only are products cheaper, but they are also better in flavor, texture, and create larger portions, according to Fisheries Science.[10]

References[edit]

Notes[edit]

  1. ^ a b c Tzeng, Chen, Tang, and Chiu (June 2009). "Microsatellite and mitochondrial haplotype differentiation in blue mackerel (Scomber australasicus) from the western North Pacifi". ICES Journal of marine science. 
  2. ^ "Blue Mackerel". Amalgameted marketing. Amalgameted marketing. 
  3. ^ Pankhurst, Neville (1989). The relationship of ocular morphology to feeding modes and activity periods in shallow marine teleosts in New Zealand. Kluwer academic publishers. 
  4. ^ a b c Studholme, Packer, Berrien, Johnson, Zetlin, and Morse (September 1999). Atlantic Mackerel, Life History and Habitat Characteristics. U.S. Department of Commerce. 
  5. ^ a b Yukami, Oshimo, Yoda, and Hiyama (1 February 2009). Estimation of the spawning grounds of chub mackerel and spotted mackerel in the East China Sea. Fisheries Science. 
  6. ^ Neira and Keane (July 2008). Ichthyoplankton-based spawning dynamics of blue mackerel in South-Eastern Australia. Fisheries Oceanography. 
  7. ^ a b "Blue Mackerel" (PDF). Wild Fisheries Research Program. I&INSW. Retrieved 10 February 2015. 
  8. ^ a b Stewart, John, and Ferrel, Douglas (10 March 2000). "Age, Growth, and landings of yellowtail scad and blue mackerel off the coast of New South Whales, Australia". New Zealand Journal of marine and freshwater research. 
  9. ^ "Blue Mackerel" (PDF). Wild Fisheries Research Program. I&INSW. Retrieved 12 February 2015. 
  10. ^ Chung, Ho, Chyan, and Jiang (February 2009). Utilization of freeze-dried mackerel muscle proteins as a binder in restructured meat. Fisheries Science.