Tahitian Prawn
探検Animal
Tahitian Prawn
macrobrachium lar
The Tahitian Prawn, scientifically known as Macrobrachium lar, is an impressive freshwater crustacean native to the tropical streams and rivers of the Indo-Pacific region. This resilient decapod is highly regarded for its fascinating amphidromous life cycle, starting its life as larvae in brackish estuaries or the ocean before embarking on a challenging upstream migration into pristine mountain streams. Known for their distinctively long claws and active behavior, these prawns are vital ecological contributors, helping clean riverbeds by scavenging and keeping aquatic insect populations in check. They are highly adaptable creatures, capable of scaling wet rock faces to bypass waterfalls during their migration, which makes them a true marvel of river ecosystems.
生息地: Typically found in clear, fast-flowing freshwater streams and rivers with rocky substrates and overhanging vegetation throughout the Indo-Pacific islands.
外見
This large prawn is characterized by its robust, marbled dark brown to deep bluish-black body, often with subtle lighter patterning along the abdominal segments. Mature males are particularly striking, possessing an exceptionally long and robust second pair of walking legs modified into powerful claws, which are often uneven in size and display a blue-grey coloration. The carapace is smooth and tough, while its long, sensitive antennae extend forward to detect prey and predators. Fully grown specimens typically measure between 10 to 18 centimeters in length, excluding their claws.
界Animalia門Arthropoda綱Malacostraca目Decapoda科Palaemonidae属Macrobrachium
カテゴリ
Animalレア度
Common
危険度
1/5 · 非常に低い
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おもしろい事実
Despite living in freshwater as adults, their larvae cannot survive without saltwater, requiring a journey to the ocean and back.
During upstream migration, juvenile Tahitian Prawns can climb vertical rock faces of waterfalls by gripping onto wet moss and algae.
Males have highly asymmetrical claws, with one often being much larger and stronger, used for defending territories and courting females.
特殊能力
能力
Waterfall Climbing
They can crawl out of the water on wet rock surfaces to climb up steep waterfalls during upstream migration.
能力
Amphidromous Migration
Larvae develop in saltwater before juveniles migrate back to freshwater rivers to mature.
能力
Rapid Tail-Flip Escape
They rapidly flex their muscular abdomen to swim backward at high speeds when threatened.
サイズと詳細
- 長さ
- 10-18 cm
- 体重
- 0.05-0.15 kg
- 寿命
- 2-4 年
- 一度の産卵数
- 5000-20000
- 抱卵期間
- 15-24 日
- 渡りの距離
- 15 km
食性と食事
A generalist feeder that consumes a mixture of detritus, aquatic insects, algae, and small invertebrates found on stream beds.
年齢による違い: Larvae feed primarily on marine plankton, whereas adults transition to scavenging and opportunistic predation in freshwater habitats.
主な食物
- Algae
- Aquatic insects
- Decaying leaf litter
- Small fish
- Snail larvae
採餌方法
- Foraging
生態系とのつながり
eaten by
Giant Mottled Eel
Anguilla marmorata
Preyed upon by large eels inhabiting the same freshwater streams.
hunts
Red-rimmed Melania
Melanoides tuberculata
Feeds opportunistically on small freshwater snails along the riverbed.
competitor
Atyid Shrimp
Atyopsis spinipes
Competes for shelter and food sources in riverine rock crevices.
特徴
このオブジェクトにはまだ特徴バッジが割り当てられていません。
別名
まだ別名はありません。
コレクション
テーマが追加されると、このオブジェクトのコレクションがここに表示されます。
安全性
危険度
1/5 · 非常に低い
まだ特別な安全上の注意はありません。
よくある質問
Tahitian Prawnを見分けるには？
Tahitian Prawnを識別する最も簡単な方法は、Snappit自然識別アプリを使用することです。
Tahitian Prawnの長さは何ですか？
10-18 cm
Tahitian Prawnの体重は何ですか？
0.05-0.15 kg
Tahitian Prawnの寿命は何ですか？
2-4 年
Tahitian Prawnは何を食べますか？
A generalist feeder that consumes a mixture of detritus, aquatic insects, algae, and small invertebrates found on stream beds.
Tahitian Prawnは通常どこに生息していますか？
Typically found in clear, fast-flowing freshwater streams and rivers with rocky substrates and overhanging vegetation throughout the Indo-Pacific islands.
Tahitian Prawnはどのように狩りをしますか？
Foraging
Tahitian Prawnの一度の産卵数は何ですか？
5000-20000
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