Oncorhynchus masou

The masu salmon (Oncorhynchus masou), also known as masu (Japanese: マス, lit.'trout') or cherry trout (桜鱒, サクラマス, sakura masu) in Japan,^[3][4] is a species of salmonid belonging to the genusOncorhynchus, found in the North Pacific along Northeast/East Asian coasts from the Russian Far East (Primorsky, Kamchatka Peninsula, Sakhalin and Kuril Islands) to south through Korea, Japan and Taiwan. Although generally accepted as a salmon in the West, the fish is actually regarded as a trout in Japan (its most famous native range) as it is the most commonly seen freshwater salmonid in the Japanese archipelago.

A number of subspecies are known, including the widespread nominate subspeciesyamame (O. m. masou), the critically endangered Formosan salmon (O. m. formosanus) in landlocked waters of Taiwan, the Biwa trout (O. m. rhodurus) endemic of Lake Biwa, and the anadromousamago (O. m. macrostomus) restricted to western Japan.

A masu salmon which has reached sexual maturity has a darkened back, and the stripes on the body sides become bright red with crimson tinge to merge on the abdomen into one common longitudinal band of lighter color. For this reason, it was given the name cherry salmon.

As adults, masu salmon tend to weigh 2.0 to 2.5 kg (4 lb 7 oz to 5 lb 8 oz) and measure roughly 50 cm (20 in) in length.^[5] The maximum size that can be attained by this species (which is in the region of Primorsky Krai) is 71 cm (28 in) long and 9 kg (19 lb 13 oz) in weight.

平均的に、このサケは北緯65～58度の温帯気候を好み、海では水深0～200メートル（0～660フィート）を好みます。  

このサケは、他の多くのサケと同様に、漁業で漁獲され、養殖され、また釣り魚としても人気が高い、商業的に非常に重要な魚種です。生鮮品や冷凍品として販売され、グリルやオーブン焼きにして食べられることが多いです。

• ああ、m。 masou — マスサーモン、遡上（海を走る）形態。内陸に住む個体群はヤマメ（山女魚ヤマメ）とも呼ばれます
  • ああ、m。 ishikawae —サツキマス(皐月鱒 サツキマス、サツキマス)、黒い斑点のある形。^{[ 6 ]}アマゴ(雨魚アマゴ)とも呼ばれる内陸の個体群
  • ああ、m。変数イワメ—岩女魚イワメ、劣性斑点のない形
• O. m. rhodurus — タイプ標本は芦ノ湖（箱根湖）産で、以前は琵琶湖（ O. biwaensis）^{と同じ種として同定されていた[ 7 ] [ 8 ]。}
• O. m. macrostomus — アカマス；西日本固有種
• O. m. formosanus — タイワンザケ、梨山マス（中国語：梨山鱒）、またはスラマウマス（梨山のタイアル語名）、台湾中部山岳地帯固有の陸封型。