Freshwater Drum

aplodinotus grunniens

The Freshwater Drum, scientifically known as Aplodinotus grunniens, is a fascinating and highly adaptable fish native to the fresh waters of North and Central America. As the sole North American member of the drum family (Sciaenidae) to inhabit freshwater exclusively, it stands out among typical lake and river species. This bottom-dwelling fish is famously named for the distinctive, low-frequency grunting or drumming sounds males produce during the spawning season. These sounds are generated by special muscles vibrating against their swim bladder and can sometimes be heard by humans above the surface on quiet summer evenings. Besides its musical talents, the Freshwater Drum is historically and culturally significant; its massive, ivory-like ear stones, known as otoliths, have been collected as 'lucky stones' for centuries. Ecologically, it plays a vital role as a benthic predator, renowned for its ability to crush hard-shelled prey like the invasive zebra mussel, making it an unsung hero of many freshwater ecosystems.

生息地: Found in the bottom waters of large, clear rivers, deep natural lakes, and expansive reservoirs, typically preferring areas with sandy or gravel substrates.

外見

The Freshwater Drum has a deep, heavy-bodied, and distinctly humpbacked appearance, tapering down to a narrow tail. Its coloration ranges from silvery-gray on the back and sides to a bright, contrasting white belly, often taking on a bronze or brownish hue in murky waters. A key identifying feature is its lateral line, which remarkably extends entirely through its rounded caudal (tail) fin, a hallmark of the drum family. It possesses two dorsal fins that appear joined; the first is supported by stiff, sharp spines, while the second is much longer and composed of soft rays. The fish features a blunt snout with a subterminal mouth positioned slightly underneath, perfectly adapted for bottom feeding.

界Animalia門Chordata綱Actinopterygii目Acanthuriformes科Sciaenidae属Aplodinotus

Freshwater Drum

カテゴリ

魚類

レア度

Common

危険度

1/5 · 非常に低い

スナップ

最初にスナップしよう！

おもしろい事実

The freshwater drum is the only North American member of the Sciaenidae family that lives its entire life in freshwater.

Their ear stones, or otoliths, are exceptionally large and ivory-like; they have long been collected by beachcombers and Native Americans as 'lucky stones'.

They are incredibly long-lived; while most live around 7 to 14 years, scientists have found otoliths indicating some individuals have survived for over 70 years.

Unlike most North American freshwater fish that attach their eggs to the bottom, the freshwater drum releases buoyant, pelagic eggs that float freely near the surface.

特殊能力

Males possess specialized sonic muscles that repeatedly strike their swim bladder to create a deep, resonating drumming sound used to attract mates.

They have powerful pharyngeal (throat) teeth specially adapted to crush the hard shells of snails, clams, and mussels.

Their abnormally large inner ear stones provide exceptional balance and sensory perception in deep, murky water environments.

サイズと詳細

長さ: 30-75 cm
体重: 1-16 kg
寿命: 7-72 年
Top Speed: 25 km/h
一度の産卵数: 40000-90000
抱卵期間: 1-3 日

食性と食事

A benthic predator that feeds primarily on hard-shelled mollusks, aquatic insects, and small crustaceans along the water's bottom.

年齢による違い: Juveniles feed mostly on zooplankton and small chironomid larvae, shifting heavily toward hard-shelled mollusks, crayfish, and small fish as they mature and develop stronger pharyngeal teeth.

主な食物

Zebra mussels
Snails
Aquatic insects
Small fish
Crayfish

採餌方法

Foraging

生態系とのつながり

hunts

Zebra Mussel

Dreissena polymorpha

Feeds extensively on invasive zebra mussels, acting as a natural biological control agent.

eaten by

Northern Pike

Esox lucius

Juvenile drums are an important food source for large predatory sportfish.

competitor

Common Carp

Cyprinus carpio

Competes directly for benthic invertebrate food resources in shared habitats.

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

Freshwater Drumを見分けるには？

Freshwater Drum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。

Freshwater Drumの長さは何ですか？

30-75 cm

Freshwater Drumの体重は何ですか？

1-16 kg

Freshwater Drumの寿命は何ですか？

7-72 年

Freshwater Drumのtop Speedは何ですか？

25 km/h

Freshwater Drumは何を食べますか？

A benthic predator that feeds primarily on hard-shelled mollusks, aquatic insects, and small crustaceans along the water's bottom.

Freshwater Drumは通常どこに生息していますか？

Found in the bottom waters of large, clear rivers, deep natural lakes, and expansive reservoirs, typically preferring areas with sandy or gravel substrates.

Freshwater Drumはどのように狩りをしますか？

Foraging