Jack mackerel

Maori name: hauture
Scientific name: Tracherus declivis, T. novaezelandiae, T. murphyi
Availability: Year round
Weight: 0.2–0.8kg, up to 1.5kg
Length: 15–45cm

Jack mackerel

Maori name: hauture
Scientific name: Tracherus declivis, T. novaezelandiae, T. murphyi
Availability: Year round
Weight: 0.2–0.8kg, up to 1.5kg
Length: 15–45cm
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Location

Jack mackerel (T. declivis), are found only in Australasian waters, especially in the central and northwestern seas.

Attributes

Green/blue body with a green sheen, white below, and streamlined with long pectoral fins and obvious lateral line. There are varieties in colour and number of scutes. Wide overlapping scales along lateral line expand to hard ridge at tail base.

 

Horse jack mackerel (T. novaezelandiae) is smaller and slightly deeper-bodied. Green with broad but faint brown bands, white below and grows to 30 to 40 cm. They are distributed from Australasia through southeast Asia to Japan.

 

Slender jack mackerel (T. murphyi) is a slender-bodied large bluegreen species. First found in New Zealand in the early 1980s, it extended territory from the eastern Pacific Ocean to the southern.

Family

Three Jack mackerel species are found around New Zealand: T. declivis, T. novaezelandiae, and T. murphyi, all pelagic species belonging to the Carangidae family (trevallies, kingfishes).

Spawning

Summer spawners, they occur in large schools and grow fairly quickly to live for 15 to 25 years.

Sustainability

All three jack mackerel species have been included in the Quota Management System since 1996; they have different geographical distributions, although their ranges partially overlap. For assessment purposes, the three species are treated separately where possible. Catch records extend back to 1946, though landings were small until the mid 60s. The Chilean jack mackerel appeared in New Zealand waters in the 1980s but is not thought to breed here.

Fishing methods

Jack mackerel are trawled year-round along the coast. Horse mackerel are often found in harbours and bays, living at depths of up to 300 metres, they are caught by purse seiners off the northeast coast. Slender jack mackerel are found around central and southern New Zealand, they are caught by trawler.

Nutrition

Jack mackerel is a good source

To quality for a 'good source' claim the food must contain at least 25% of the RDI.
The Recommended Dietary Intake (RDI) is considered to be the average daily dietary intake level that is sufficient to meet the nutrient requirements of nearly all (97–98 per cent) healthy individuals in a particular life stage and gender group.

of Selenium

Selenium is necessary for normal immune system function and for the production of thyroid hormones and it contributes to the maintenance of hair and nails

, Vitamin B12

Vitamin B12 is necessary for normal neurological function and it contributes to blood formation, energy metabolism and to the growth and development in children

and Vitamin D

Vitamin D is necessary for normal bone structure and the utilisation of calcium and phosphorus and it contributes to the maintenance of normal teeth

; and a source

To quality for a 'source' claim the food must contain at least 10% of the RDI.
The Recommended Dietary Intake (RDI) is considered to be the average daily dietary intake level that is sufficient to meet the nutrient requirements of nearly all (97–98 per cent) healthy individuals in a particular life stage and gender group.

of Iodine

Iodine is necessary for the production of thyroid hormones, for normal neurological function and for normal energy metabolism, and it contributes to the growth and development in children

, Iron

Iron is necessary for the transport oxygen, for normal immune system function and for normal neurological development in the foetus, and it contributes to energy production and the reduction of tiredness and fatigue

, Phosphorus

Phosphorus is necessary for normal teeth, bone and cell membrane structure and for energy metabolism

, Potassium

Potassium is necessary for water and electrolyte balance, it contributes to the functioning of the nervous system and normal muscle function; and to the normal growth and development of children

and Niacin (vitamin B3)

Niacin (vitamin B3) is necessary for the release of energy from food and for the normal structure and function of skin and mucous membranes, and contributes to the reduction of tiredness and fatigue

.

Seafood is a highly nutritious food and is a great source of protein

Protein is necessary for tissue building and repair, normal growth and development of bone in children and adolescents aged 4 years and over, and contributes to growth and maintenance of muscle mass

. Many species are low in saturated fat and a number of them are a good source of Omega 3

Omega 3 is a group of fatty acids that contribute to heart health

.

Tips

Jack mackerel flesh is oily, dark but lightens on cooking and suited to most cooking methods. Bake; bbq; casserole; curry; marinate; poach; smoke; or steam.

Buying & Storage Tips

When buying whole jack mackerel, always check the...
EYES: Bright and clear cornea, shiny black pupil
GILLS: Rosy pink pastel coloured gills
SKIN: Bright, with a luminous sheen

When buying jack mackerel fillets, always check the...
FLESH: semi-transparent and glossy

If the fish looks sticky or mushy then it is not fresh.