水盆

陸寄居蟹雖然棲息在陸地上,但牠們和所有生物都一樣,要飲用水來維持生命。在飼養缸內放置水盆還可以幫助保持飼養缸的濕度,使牠們有足夠的濕度呼吸。

跟據< Water uptake in terrestrial hermit crabs: amorpho-functional analysis >論文提到,陸寄居蟹會利用第三顎足的剛毛接觸水或濕潤的沙,把水帶到口裏。

參考過外國的書籍和網站(以下幾段英文資料),雖然有些物種的陸寄居蟹棲息在海灘附近,有些物種棲息在紅樹森或近內陸甚至叢森地區,但牠們都要攝取鹽分,只是鹽分攝取會有差別。

而且有說海水裏的礦物質補充會使牠們的甲殼更堅硬和增加脫皮的成功率,所以在飼養下,除了淡水,大家也要提供海水,讓牠們自行選擇攝取那一種,調節適當的鹽分。

Although there are relatively few species of Coenobita, individuals are numerous in tropical and subtropical maritime regions particularly supralittoral areas and small islands, although some penetrate further inland. Certain species are restricted to beaches (e.g. C. perlatus (H. Milne Edwards, 1837), C. scaevola (Förskal 1775), C. spinosus (H. Milne Edwards, 1837), C. cavipes (Stimpson, 1838) while several other species may penetrate long distances inland, e.g. C. clypeatus (Herbst, 1791) on Curaçao, C. rubescens (Greeff) and C. brevimanus (Dana, 1852) in rainforest, C. compressus (H. Milne Edwards) (de Wilde; 1973; Burggren and McMahon, 1988). Coenobita rugosus (H. Milne Edwards, 1837) may live on the beach or penetrate inland in situations where fresh water is available (Yamaguchi, 1938; Vannini, 1976).
Greenaway (2003 p. 13)
Terrestrial adaptations in the Anomura (Crustacea: Decapoda)
Beach-dwelling Land Hermit Crabs Some hermit crabs live on or close to beaches and would have access to seawater and a diet high in salt. In captivity they will need access to sea water. You will often find hermit crabs which have been denied sea salt water solutions spending a lot of time in the ocean water dish once you get them home. Within the United States C. perlatus and C. cavipes are available in some pet stores and mall carts. According to Peter Greenaway, these species are beach-dwelling land hermit crabs and would require access to sea water to survive. "Certain species are restricted to beaches (e.g. C. perlatus (H. Milne Edwards, 1837), C. scaevola (Förskal 1775), C. spinosus (H. Milne Edwards, 1837), C. cavipes (Stimpson, 1838)... Beach-dwelling coenobitids drink seawater or extract it from damp sand and often immerse themselves to flush the shell.. " Greenaway (2003 p. 13-16)
Other land hermit crabs. Despite living away from beach areas most hermit crabs will drink the sea water from time to time or access salt through their diet. You may find your Carribean (Purple Pincer aka C. clypeatus) hermit crabs drinking the sea water. While they may not have ready access to seawater in the wild they do drink it while in captivity, and there is often a link between excessive drinking of sea water and an impending moult."Coenobita spp. that live away from the beach do not usually have access to seawater and indeed these species prefer dilute water unless they are depleted of salt (de Wilde, 1973). " Greenaway (2003 p. 16)

淡水

淡水可用涼開水(煮沸過後隔夜的飲用食水,隔夜的目的是除去氯氣)或自來水(首要任務就是用除氯劑除氯)。不要給陸寄居蟹喝含有氯氣的水,陸寄居蟹是利用鰓部呼吸,含有氯氣的水會傷害牠們的健康。

海水

我們可以購入飼養海水魚的人工海鹽(海水素),用隔夜的淡水或已除氯的自來水來調教人工海水。人工海鹽品牌方面,我推薦RED SEA SALT或INSTANT OCEAN,注意人工海鹽要保持乾燥,勿受潮。

調教人工海水:

調教人工海水的工具有量杯、鹽分比重計、攪伴用的棍子。把調教好的海水慢慢注入鹽分比重計,注入時把鹽分比重計斜斜的放著,防止氣泡產生,如還有氣泡,請把氣泡弄走。

正確海水比重為1.020 – 1.024,注意調好後如果發現有些海鹽未能完全溶解而沈澱在量杯底,請不要把底部的海水倒進水盆,以免使海水濃度過高。

水盆

請使用水盆來盛載,建議可以用爬蟲類用水盆,塑膠盆或用玻璃器皿,飼養小型個體可以用水晶蝦的餵食盆當水盆。請注意如果水盆的水位太深不能爬出來,陸寄居蟹會易溺斃,大家可在水盆內放些小石、碎珊瑚來調節深度。

爬蟲類用水盆

請不要使用含有金屬、會溶解出有害物質、或軟塑膠的器皿來當水盆。陸寄居蟹難以進出的器血,像下圖業者推出的水盆,或表面太光滑的碟子也不適合。

日本或外國一些蟹友會在主缸加一個小的玻璃缸或塑膠缸做海水缸,替海水打氣或安裝過濾器,使水不斷循環地流動。水質經過濾器過濾後會變得更清潔。不過我自己只是用一般水盆多年,沒有打氣或裝過濾器,沒有任何問題,大家可因應主缸設計來自行決定。

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