ピノキオシュリンプ (Caridina gracilirostris)

科: Atyidae

レッドノーズシュリンプは琉球列島～インドに分布する Caridina gracilirostris で、頭より長い吻と赤い眼の周りが特徴です。体長約3～4cm、20～26℃の弱アルカリ性水。水草水槽の優れたコケ取りです。

飼育条件

水温: 22–28 °C
pH: 6.5–7.5
GH硬度: 5–12 dGH
成魚の体長: 3–4 cm
最小水槽: 30 L
泳ぐ水層: Middle to bottom — grazing with its long rostrum
飼育難度: 中級
性格: Very peaceful

種の概要

Red Nose Shrimp is Caridina gracilirostris, the long-beaked atyid from the Ryukyu Islands of Japan through Taiwan to India, instantly recognizable by a rostrum — the needle-like beak — longer than its head, plus a red-orange mask over the eyes and often a red-tipped tail. Wild populations live in coastal streams where larvae drift to brackish water, yet in the aquarium it adapts well to pure freshwater, making it one of the few 'brackish-origin' shrimp that thrives in a planted community tank. It reaches 3-4 cm, prefers 20-26 °C, mildly alkaline water around pH 7.0-7.8 and moderate hardness, and is a dedicated algae eater that combs filamentous algae and biofilm from leaves and wood without damaging plants. It is active by day, bold for a caridina, and safe with small fish though shrimplets need cover. Breeding occasionally succeeds in freshwater, but a little marine salt in a rearing tank raises larval survival dramatically. Its Japanese name, 'tumitate-ebi', means pile-driving shrimp — a fitting image for that remarkable beak.

原生環境

生息地: Coastal streams and mangrove edges with plants
水流: Gentle current
溶存酸素: Moderate oxygen

レイアウトと設備

底床: Sand with leaf litter
流木・石組: Driftwood and dense plants for grazing
水草: Dense plants; may eat very tender shoots

性格・餌・混泳

群泳性: Groups of 5 or more
餌: Algae and biofilm grazer; accepts fine foods
おすすめの混泳相手: Small peaceful community fish — Adults safe; plant cover for shrimplets
Neocaridina and hardy Caridina — Overlapping chemistry, no serious conflict
Otocinclus catfish — Two algae specialists, one tank
混泳しないほうがいい相手: Copper-based medications — Lethal to all invertebrates
Very soft acidic setups — Not its preferred water
Large-mouthed fish — Shrimp are prey

繁殖と注意点

雌雄の違い: Females grow larger and deeper; males stay slim with a proportionally even longer rostrum.
繁殖方法: Occasionally breeds in pure freshwater — the female carries 15-25 eggs that hatch as swimming larvae. Larval survival improves dramatically with a little marine salt (around 5 g/L) in the rearing container, fed on liquid fry food and newly hatched brine shrimp.

よくある質問

ピノキオシュリンプは飼育しやすい？

難易度：中級。Very peaceful。

ピノキオシュリンプの適水温と水質は？

適水温 22–28 °C。22–28 °C stable range。Stable 22–28 °C。

ピノキオシュリンプの大きさと水槽サイズは？

成魚は 3–4 cm。最低 30 L。

ピノキオシュリンプの餌は？

Algae and biofilm grazer; accepts fine foods。Sand with leaf litter上で採餌する性質を活かし、沈む餌も与える。

ピノキオシュリンプは混泳できる？

Very peaceful。混泳の相手：Small peaceful community fish — Adults safe; plant cover for shrimplets, Neocaridina and hardy Caridina — Overlapping chemistry, no serious conflict, Otocinclus catfish — Two algae specialists, one tank。Copper-based medications — Lethal to all invertebrates, Very soft acidic setups — Not its preferred water, Large-mouthed fish — Shrimp are preyは避ける。

ピノキオシュリンプの原産地は？

Southeast Asia — brackish coastal waters原産。Coastal streams and mangrove edges with plants、Gentle current。

ピノキオシュリンプは飛び出す？

換水・メンテ時はふたを推奨。

ピノキオシュリンプの繁殖は？

繁殖：Occasionally breeds in pure freshwater — the female carries 15-25 eggs that hatch as swimming larvae. Larval survival improves dramatically with a little marine salt (around 5 g/L) in the rearing container, fed on liquid fry food and newly hatched brine shrimp.。Females grow larger and deeper; males stay slim with a proportionally even longer rostrum.。