Mahi-mahi means "very strong" in Hawaiian (also known widely as dorado) is a surface-dwelling ray-finned fish found in off-shore temperate, tropical and subtropical waters worldwide. 
Mahi-mahi can live up to 5 years, although they seldom exceed four. Catches average 15 to 29 lb. They seldom exceed 33 lb, and mahi-mahi over 40 lb are exceptional.
Mahi-mahi have compressed bodies and a single long-based dorsal fin extending from the head almost to the tail. Their caudal fins and anal fins are sharply concave. They are distinguished by dazzling colors: golden on the sides, and bright blues and greens on the sides and back. Mature males have prominent foreheads protruding well above the body proper. Females have a rounded head. Females are also usually smaller than males.
The pectoral fins of the mahi-mahi are iridescent blue. The flank is broad and golden. 3 black diagonal stripes appear on each side of the fish as it swiftly darts after prey.
Out of the water, the fish often change color, going though several hues before finally fading to a muted yellow-grey upon death.
Mahi-mahi are among the fastest-growing fish. They spawn in warm ocean currents throughout much of the year, and their young are commonly found in seaweed. Mahi-mahi are carnivorous, feeding on flying fish, crabs, squid, mackerel, and other forage fish. They have also been known to eat zooplankton and crustaceans.
Mahi-mahi often swim near debris such as floating wood, palm trees and fronds, or sargasso weed lines and around fish buoys.
Mahi-mahi are highly sought for sport fishing and commercial purposes. Sport fishermen seek them due to their beauty, size, food quality, and healthy population. 
Thirty- to fifty-pound gear is more than adequate when trolling for mahi-mahi. Fly-casters may especially seek frigatebirds to find big mahi-mahis, and then use a bait-and-switch technique. Ballyhoo or a net full of live sardines tossed into the water can excite the mahi-mahis into a feeding frenzy. Hookless teaser lures can have the same effect. After tossing the teasers or live chum, fishermen throw the fly to the feeding mahi-mahi. Once on a line, mahi-mahi are fast, flashy and acrobatic, with beautiful blue, yellow, green and even red dots of color.
Blue marlin are distributed throughout the tropical and subtropical waters of the Atlantic, Indian, and Pacific Oceans. A bluewater fish that spends the majority of its life in the open sea far from land, the blue marlin preys on a wide variety of marine organisms, mostly near the surface. It uses its bill to stun, injure, or kill while knifing through a school of fish or other prey, then returns to eat the injured or stunned fish.
Marlin is a popular game fish with a relatively high fat content. The biggest females are more than four times as heavy as the biggest males, which rarely exceed 350 lb in weight. The longest females can reach a length of 16 ft with the bill, constituting about 20% of the total body length - making their body mass about 1,190 to 1,810 lb.
The marlin has two dorsal fins and two anal fins. The fins are supported by bony spines known as rays. Its first anal fin, along with its pectoral and caudal fins, can be folded into grooves. This streamlines the fish and thereby reduces drag.
Blue marlin, like other billfish, can rapidly change color. However, the body is most often blue-black on top with a silvery white underside. It has about 15 rows of pale, cobalt-colored stripes, each of which has round dots and/or thin bars, located on both sides of the fish. The body is covered with thick, bony, elongated scales 
The bill is long and stout. Both the jaws and the roof of the mouth are covered with small, file-like teeth. The nerves in the mouth are so sensative, they can feel weak water motions and large changes in pressure.
Blue marlin are found year-round in tropical oceanic waters of the Atlantic and Indo-Pacific. The range expands into temperate waters of the Northern and Southern Hemispheres during the warmer months and contracts towards the Equator during colder months.
Once blue marlin reach maturity, they have few predators, with the most important probably being large pelagic sharks such as the shortfin mako and great white shark. Other potential predators include toothed whales such as the false killer whale and killer whale.
Catch one today!
Aku is a medium-sized perciform fish in the tuna family, Scombridae. It grows up to 3 ft in length.
Aku is a streamlined, fast-swimming pelagic fish, common in tropical waters throughout the world, where it inhabits surface waters in large shoals (up to 50,000 fish), feeding on fish, crustaceans, cephalopods, and molluscs. It is an important prey species for large pelagic fishes and sharks. It has no scales, except on the lateral line and the corselet (a band of large, thick scales forming a circle around the body behind the head). It commonly reaches lengths up to 31 in and a weight of 18–22 lb. Its maximum fork length is 43 in and maximum weight is 76 lb. Aku estimates a lifespan range between 8 and 12 years.
Want to catch some of your own?
Most resent observations (from all our affiliated Captains) stat this has been the best year for deep sea fishing! Catches are coming back in record breaking amounts and record breaking sizes.... but why?
Theory goes it's due to El Niño.
El Niño events are associated with physical and biological changes in our oceans that affect fish distribution. Among the variations in oceanographic features that are observed following an El Niño/Southern Oscillation (ENSO) event are changes in sea-surface temperatures, changes in the vertical, thermal structure of the ocean (particularly in coastal regions), and altered coastal and upwelling currents. These changes can directly affect the species composition and abundance of fishes. In the northern hemisphere, El Niño events typically result in observations of tropical, warm water species moving north (thereby extending their range). Cold water species move north or into deeper water (thereby restricting their range). Surface-oriented, schooling fish often disperse and move into deeper waters. Fishes that remain in an affected region experience reduced growth, reproduction, and survival.
For your benefit, El Niño increases your chances of catching The Big One on your trip to Hawaii!! Book a Deep Sea Trip Today
Ahi is among the larger tuna species, ranging as high as 2.4 m (94 in) in length and 200 kg (440 lb) in weight. The name comes from the second dorsal fin and the anal fin, as well as the finlets between those fins and the tail, as they are bright yellow. The main body is a very dark metallic blue, changing to silver on the belly, which has about 20 vertical lines.
Ahi often travel in schools with similarly sized companions. They sometimes school with other tuna species and mixed schools of small yellowfin and skipjack tuna, in particular, are commonplace. They are often associated with various species of dolphins or porpoises, as well as with larger marine creatures such as whales and whale sharks. They also associate with drifting flotsam such as logs and pallets, and sonic tagging indicates some follow moving vessels.
Ahi prey include other fish, pelagic crustaceans, and squid. Like all tunas, their body shape is designed for speed, enabling them to pursue and capture fast-moving baitfish such as flying fish, sauries, and mackerel. Schooling species such as myctophids or lanternfish and similar pelagic driftfish, anchovies, and sardines are frequently taken. Large Ahi pray on smaller members of the tuna family such as frigate mackerel and skipjack tuna.
In turn, Ahi are preyed upon when young by other pelagic hunters, including larger tuna, seabirds, and predatory fishes such as wahoo, shark, and billfish. Adults are threatened only by the largest and fastest hunters, such as toothed whales, particularly the false killer whale, pelagic sharks such as the mako and great white, large Atlantic blue marlin and Pacific blue marlin, and black marlin.
Ahi are able to escape most predators, because unlike most fish, tuna are warm-blooded, and their warm muscles make them extremely strong swimmers, with Ahi reaching "speeds of up to 50 miles per hour". (They can navigate enormous distances, sometimes crossing entire oceans.)
To catch your own!
There really is no fishing seasons in the Hawaiian islands, nothing predictable anyway. Hawaii's gamefish are pelagic and the Hawaii Islands are a stop over on the fish's on going pursuit of food. Hawaii’s gamefish live to eat and make little fish, hopefully before they are eaten themselves by another, bigger predator, with movement based on currents and water temperatures.
Hawaii is the only place in the world where marlin weighing over 1000 pounds have been caught during every month of the year. In Fact, all the top gamefish mahi mahi, ono, ahi, blue and striped marlin can be caught during any month of the year, it’s just that some times of year can be more rewarding than others.
There are seasonal trends and there is overlapping though:
The larger blue marlin that show up in Maui waters during the summer months are tapering off, though a few big ones can still be caught in September. The fall is the time for Big Eye Tuna. Smaller ahi (yellowfin tuna) and mahi mahi (dorado) can still be caught in the fall too, though the number of mahi tend to drop slightly as winter approaches. Marlin hookups, while they do occur, are rarer as winter approaches. Strikes that do occur do so farther offshore.
After Labor day charters tend to slow down, so it can be very hard to get on a shared charter as not enough people will sign up, so private charters are the best way to ensure you will get out.
Winter start of slow in the Hawaii sport fishing industry, but gets busy towards the end. Fishing is good, but with fewer “hot” bites like we see in the summer. Big Eye tuna are in season during the winter. The mahi bite is still consistent, and striped marlin are showing up more in January.
November visitor crowds peak the weekend before Thanksgiving. It is very busy here during Thanksgiving week. After Thanksgiving week, things get quiet again until after the second week of December, when we ready ourselves for the busiest time of the year on Hawaiii.
While spring may not be the best time for the big blue marlin, many of the others big game fish are reaching good numbers. May in particular can be a very productive month to fish off the shores of Hawaii. All in all, spring fishing off Hawaii can be an exciting time to fish. Striped marlin begin appearing in greater numbers in February. March and April they’re pretty common
From Mid March through the first week of April things are busy here for fishing charters, with spring break so book early.
Summer is great for the larger fish such as blue marlin in excess of 500lbs, and ahi (yellowfin tuna) over 100lbs are caught more during the summer than at any other time during the year. The quality and size of the fish can be better than the consistency in the summer, with no catches some days and then huge fish caught the next.
More families and wedding parties or groups come to Hawaii in the summer months, so larger boats are in High demand.
The day After Thanksgiving (Friday) is known as Black Friday. This also is unofficially or officially start of holiday shopping season. Almost all stores come out with Doorbuster Sales with early bird special to attract consumers to their stores. People stand in line hours before store is opened, to grab the bargain of the year. Almost every store has something that interests every one. For bargain hunters, if there is a biggest festival in a year, that would be, no doubt, the Black Friday.
For Black Friday Deals at Hawaii Deep Sea Fishing:
