Definition

Noun: 1. A large, powerful, predatory saltwater fish: A marlin is a type of large, fast-swimming fish that lives in the open ocean. It is characterized by a long, spear-like upper jaw (rostrum) and a tall, rigid dorsal fin. Marlins are highly prized as game fish for sport fishing due to their size, speed, and fighting ability when hooked.

Usage

The word "marlin" is used to refer to the fish itself, either as a species or as an individual catch. It is a countable noun. * The angler spent hours fighting to reel in the massive blue marlin. * Marlins are among the fastest swimmers in the ocean. * We saw a marlin leap clear out of the water.

Advanced Usage & Biological Note

• Partial endothermy: Unlike most fish, which are cold-blooded (ectothermic), marlins possess a specialized physiological adaptation. They have a heat-exchange system that allows them to warm their brains and eyes above the temperature of the surrounding water. This trait, mentioned in the reference, enhances their visual acuity and hunting performance in cooler, deeper waters.

Variants and Related Words

• Blue marlin (): A very large species, often the target of big-game fishing tournaments.
• Striped marlin (): Known for its distinctive blue stripes and acrobatic leaps.
• White marlin (): A smaller species of marlin.
• Sailfish: A closely related fish with a similar body shape but an even larger, sail-like dorsal fin.
• Spearfish: Another close relative, generally smaller than marlins with a shorter bill.

Synonyms

• Billfish: This is a broader category that includes marlins, sailfish, and swordfish, all characterized by their long, bony bills.
• Game fish: A general term for fish pursued for sport by anglers.

Idioms and Common Phrases

• "Hook a marlin": To successfully catch a marlin, often implying a significant achievement in sport fishing.
  • His lifelong dream was to hook a marlin in the Gulf of Mexico.
• "Fight like a marlin": To struggle with great strength and endurance, analogous to the fight a marlin puts up when hooked.
  • The boxer fought like a marlin, refusing to go down easily.

Noun

1. large long-jawed oceanic sport fishes; related to sailfishes and spearfishes; not completely cold-blooded i.e. able to warm their brains and eyes