ハーレクインシュリンプ (Caridina wolterecki)

科: Atyidae

ハーレクインシュリンプはスラウェシの古老な湖（ポソ湖・マリリ湖群）の Caridina wolterecki で、純白の体に赤褐色の不規則な帯模様が特徴です。26～30℃・pH7.5～8.5の高温硬水アルカリ性と高溶氧が必須の上級者向け種です。

飼育条件

水温: 26–29 °C
pH: 7.5–8.5
GH硬度: 6–12 dGH
成魚の体長: 2–2.5 cm
最小水槽: 30 L
泳ぐ水層: Bottom — grazing rock and sponge surfaces
飼育難度: 上級
性格: Very peaceful

種の概要

Harlequin Shrimp is the strikingly patterned Caridina wolterecki from the ancient lakes of Sulawesi, Indonesia — Lake Poso and the Malili lake system — where it clings to rocks in warm, hard, alkaline water that would kill the soft-water bee shrimp. Its body is porcelain white broken by irregular reddish-brown bands and blotches, a harlequin pattern no other popular shrimp matches. It is a specialist in every sense: 26-30 °C, pH 7.5-8.5 and 7-12 dGH, strong light encouraging the algae it grazes, and excellent oxygenation. In the aquarium it needs a dedicated Sulawesi setup — often escarpment-style rock aquascapes with very clean, well-filtered water — and accepts algae, biofilm and spirulina-based foods. It grows to 2-3 cm, is shy at first but becomes bold in stable conditions, and breeds in freshwater, females carrying 10-20 relatively large eggs. Sensitive to nitrate and to sudden changes, it rewards the specialist with one of the most beautiful patterns in the hobby. Never mix its hard alkaline regime with soft-water caridinas.

原生環境

生息地: Deep, hot, alkaline crater lake with rocky shores
水流: Gentle current
溶存酸素: High oxygen

レイアウトと設備

底床: Crushed coral or sandy rock to buffer alkalinity
流木・石組: Rocks and shell gravel with algae cover
水草: Algae-covered rocks instead of demanding plants

性格・餌・混泳

群泳性: Groups of 10 or more
餌: Algae and aufwuchs grazer; spirulina foods
おすすめの混泳相手: Other Sulawesi lake shrimp — Shared hard alkaline chemistry — the only safe mix
Sulawesi snails (Tylomelania) — Same lake system, same parameters
混泳しないほうがいい相手: Soft-water Caridina (bee shrimp lines) — Opposite chemistry; one side dies
Copper-based medications — Lethal to all invertebrates
Any nitrate-prone setup — Sulawesi shrimp demand near-zero nitrate

繁殖と注意点

雌雄の違い: Females are larger and deeper with broader banding; males slimmer with finer lines.
繁殖方法: Breeds in freshwater. The female carries 10-20 relatively large eggs for about four weeks; hatchlings are well-developed. Success depends on rock-solid parameters and clean water rather than any trick.

よくある質問

ハーレクインシュリンプは飼育しやすい？

経験者向き。Very peaceful。Groups of 10 or more。

ハーレクインシュリンプの適水温と水質は？

26–29 °C を安定して維持。pH 7.5–8.5、GH 6–12 dGH。

ハーレクインシュリンプの大きさと水槽サイズは？

成魚 2–2.5 cm 前後。Bottom — grazing rock and sponge surfacesのため 30 L 以上の水槽を推奨。

ハーレクインシュリンプの餌は？

Algae and aufwuchs grazer; spirulina foods。人工飼料に冷凍餌を組み合わせて。

ハーレクインシュリンプは混泳できる？

Very peaceful；Groups of 10 or more。向いているのはOther Sulawesi lake shrimp — Shared hard alkaline chemistry — the only safe mix, Sulawesi snails (Tylomelania) — Same lake system, same parameters。Soft-water Caridina (bee shrimp lines) — Opposite chemistry; one side dies, Copper-based medications — Lethal to all invertebrates, Any nitrate-prone setup — Sulawesi shrimp demand near-zero nitrateは不向き。

ハーレクインシュリンプの原産地は？

原産地はLake Towuti, Sulawesi, Indonesia — endemic。Deep, hot, alkaline crater lake with rocky shoresに生息。Gentle current。High oxygen。

ハーレクインシュリンプの繁殖は？

繁殖：Breeds in freshwater. The female carries 10-20 relatively large eggs for about four weeks; hatchlings are well-developed. Success depends on rock-solid parameters and clean water rather than any trick.。Females are larger and deeper with broader banding; males slimmer with finer lines.。