Hammerhead shark

by S.Y.

Introduction

image00A common Hammerhead shark is living the coast of the warm seas of the world. And they are living the sea of Kochi. I touched Hammerhead shark with a neighboring fishmonger for the first time in the days of a high school. I was fascinated what attractive. Hammerhead shark is called “Shumokuzame” from the form of the head such as wooden bell hammer ringing Japanese musical instruments in Japan, and in English, the form of the head is likened with a hammer and it is called “Hammerhead shark”.

Description & Taxonomy

Hammerhead shark is a generic name of a shark belonging to order Carcharhiniformes family Sphyrnidae. Nine kinds are known all over the world. Full length is 5 meters, and the big thing becomes 6 meters. Since the head spread horizontally like a hammer and it is sticking out, Hammerhead shark can be recognized immediately. The body back is gray and brown, yellowish-brown, and the ventral is white, there are not the fleck outstanding in particular.

Range & Ecology

Hammerhead shark lives the sea to 100 meters of depth of the water and sometimes sink to 300 meters of depth of the water. They live the offing mainly, but live the coast, a reef, and the estuary. They chase food and may come near a shore. Since eyes stick the both ends of the head, they have a view larger than other sharks, and food can be looked for easily. Hammerhead shark is a strong predator, and they feed not only fish and a cuttlefish and an octopus and Crustacea but also other sharks and prey on one another. Their favorite food is Dasyatis akajei, and they eat to the sting of a caudal fin. They move to high latitude sea area in summer, and come back to the tropical zone when it is winter. Although the life is unknown, probably about 30 years are presumed. Hammerhead shark forms a group uniquely as a shark, and acts. Occasionally the number may amount to hundreds of them.

Use & Conservation

Hammerhead shark is processed into the dried fish called “Maira” and “Tetsuboshi” in Kochi. It matches rice well. The things which is the most terrible for Hammerhead shark is fishery and indiscriminate hunting. It is said that the shark killed by human being becomes from 50 million to 100 million of them a year. In this situation the sharks become extinct. The important thing is Hammerhead shark is only one animal alike other animals, and everyone understands that they are by no means atrocious killer. Hammerhead shark is kept in many aquariums, and their mysterious shape attracts the eyes of many people. And it’s may appeal for the need of the conservation of the shark.

Viewing

If you want to meet Hammerhead shark in Kochi, let’s go to Niyodogawa after the heavy rain. They come to the mouth of a river of Niyodogawa after the heavy rain. Hammerhead shark is one of a few sharks attacking the human being, but is not ferocious as a rumor because they becomes rarely aggressive. If you come across Hammerhead shark in the sea, please read the action exactly calmly. The probability attacked by a shark is hard to happen than being struck by lightning than being stung by the hornet.