FOR AGES 3 YEARS TO 18 YEARS
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The crevalle jack is one of the most popular fish in the jack fish family. They are members of the Carangidae family of fish and have been found in both offshore and coastal areas. They can be found in large numbers in the eastern and western Atlantic Oceans, as well as off the coast of Florida.
There are different types of jack fish in the world. Even though the most common one is the crevalle jack, also known as trevally jack fish, other species include the yellow jack fish, amber jack fish (also known as yellowtail jack fish), blue runner or the hardtail jack, leather jack, black jack fish, white trevally (also known as striped jack fish), mangrove jack fish (also known as the mangrove red snapper), bluefin trevally, commonly known as jack fish Hawaii, and many more. The habitats of these fish are very extensive. The jack fish is not to be confused with tuna, which is a mackerel.
Read on for more interesting facts about the jack fish!
If you like this article on jacks, check out our other articles on yellowfin tuna and albacore tuna.
The animal jack fish typically refers to crevalle jacks. It may also refer to fish like pompano and trevally.
Jack fish belong to the class Actinopterygii and the family Carangidae.
The family of jacks includes several different species of fish under its belt. The exact number of fish is not listed.
These fish live in the ocean or coastal waters, which are either tropical or temperate in nature. Their habitats also include freshwater bodies, estuaries, brackish waters, lagoons, and bays.
The crevalle jack's habitat distribution spreads throughout the western Atlantic and eastern Atlantic regions, which ranges from Canada's Nova Scotia to Uruguay in the western Atlantic and Portugal to Angola in the eastern Atlantic Ocean. They are also found in the Mediterranean Sea, the Pacific Ocean, and the Gulf of Mexico.
Jack crevalle lives in a group called the school where more than 1,000 fish can be found. However, during the time of spawning, the pairs of crevalle jacks leave the main schools temporarily only to join the group later after the spawning process is complete.
The oldest jack fish studied was 17 years old.
Crevalle jacks (Caranx hippos) reproduce by a process called spawning. In this process, the female fish lay eggs in the water during the spawning season, and the males come and fertilize it. Female jacks can lay over a million eggs. During the process, the jack crevalle often becomes a darker shade.
The males reach sexual maturity at four or five years of age, whereas the females become sexually mature at five or six years. They reproduce all year round, although, in certain places, the peak spawning seasons vary. The adults keep the eggs and the larvae in the pelagic zone, and the small fish stay there until they become juveniles. At the juvenile stage, they swim to estuaries and lagoons, and later, when they become adults, they form schools and reside in deep waters.
Crevalle jack is found in abundance in the Atlantic water. According to IUCN, the conservation status for the fish comes the under Least Concern category.
Crevalle jack has a silver-colored body that is oblong in shape. They also have scales around their pelvic fins. Their anal fin consists of 16-17 soft rays and one spine, whereas their dorsal fin rays have 19-21 soft rays and nine spines. The front portion of the anal fin for adults is white in color, whereas the rest of the fin can be in the shades of gray and brown. Their eyes are covered by adipose eyelids. They also have a black spot on the pectoral fins.
Crevalle jack can range from green to bluish-black in the dorsal region and silvery or golden in the ventral region. The juveniles have five black stripes on their bodies which disappear when they become adults. The fish also has stronger canines in the upper jaw, behind which there is another layer of smaller teeth. In the lower jaw, there is only one row of teeth. The structure and arrangement of teeth assist these carnivorous fish in hunting prey.
The diverse color range of the crevalle jacks makes them attractive to look at. The black spot on the pectoral fins and the small patch of scales near the pelvic region near the fins sets them apart from the others.
The jacks mostly communicate with each other in a silent process using gesture and motion.
The average size of a jack is 12-30 in (30.5-76.2 cm). They are a little more than double the size of a wild goldfish. In the jack family, the females are usually bigger than the males.
The crevalle jacks can swim at the speed of 10.1 mph (16.2 kph) for 30 seconds.
On average, freshwater jack crevalle fish and saltwater jack fish can weigh around 70.5 lb (32 kg).
There are no special names attributed to the respective sexes of this fish.
Baby jacks are called spawns.
The diet of the freshwater jack fish species mainly consists of fish. They are also known to eat a lot of shrimps, crabs, and small invertebrates. The younger crevalle jack's diet consists of small fish, whereas the adults are also seen to prey on larger fish.
Jack fish, which is edible for humans, is considered not to be very appetizing. However, if cooked with proper technique, the fish can turn out to be quite wholesome and delicious. Seasoned, crispy, and golden brown fried jack fingers are one of the best delicacies made from this fish.
The crevalle jack fish is an aggressive predator and can be quite difficult for a fish breeder to keep them with other smaller fish. Also, this species needs a spawning ground which is normally in shallow water, making it difficult for them to be house pets as they prefer going back to the deep ocean waters when they are adults. The crevalle jack is also known to live in schools. So, separating them from their lifestyle may lower the chances of their survival.
Since they are both, available in offshore and coastal areas extensively, the jacks' species is commercially fishable all year. This species is also common for recreational fishing and sport.
Species of jack fish are also known to use man-made structures such as oil rig platforms as a reef for hunting prey.
Forming schools is a way that the jack fish protects itself from predators.
The northern pike (jack fish) is different from jack fish; the former is a different species of fish and belongs to a separate genus (Esox) and family (Esocidae).
One of the best techniques to catch jack fish is by using live baitfish.
Frightened crevalle jack fishes are known to produce a grunting sound when captured. They are able to emit these sounds by grinding their teeth together and creating a resonance with the air bladder.
In Florida, the fishing record for the crevalle jack is 51 lb (23.1 kg).
Here at Kidadl, we have carefully created lots of interesting family-friendly animal facts for everyone to discover! Learn more about some other fish including the red ear sunfish and the electric blue jack Dempsey.
You can even occupy yourself at home by drawing one of our Jack fish coloring pages.
https://guidesly.com/fishing/fish-species/crevalle-jack
https://seaworld.org/animals/facts/bony-fish/crevalle-jack/
https://mexican-fish.com/jack-family/
http://www.atlanticpanic.com/species/view/jack-crevalle/
https://www.texassaltwaterfishingmagazine.com/fishing/education/fishy-facts/jack-crevalle
Read The Disclaimer
At Kidadl we pride ourselves on offering families original ideas to make the most of time spent together at home or out and about, wherever you are in the world. We strive to recommend the very best things that are suggested by our community and are things we would do ourselves - our aim is to be the trusted friend to parents.
We try our very best, but cannot guarantee perfection. We will always aim to give you accurate information at the date of publication - however, information does change, so it’s important you do your own research, double-check and make the decision that is right for your family.
Kidadl provides inspiration to entertain and educate your children. We recognise that not all activities and ideas are appropriate and suitable for all children and families or in all circumstances. Our recommended activities are based on age but these are a guide. We recommend that these ideas are used as inspiration, that ideas are undertaken with appropriate adult supervision, and that each adult uses their own discretion and knowledge of their children to consider the safety and suitability.
Kidadl cannot accept liability for the execution of these ideas, and parental supervision is advised at all times, as safety is paramount. Anyone using the information provided by Kidadl does so at their own risk and we can not accept liability if things go wrong.
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