27/09/2017
Euastacus armatus 白惡鏽多刺螯蝦 -2
英文出處 :youtube vid
The Murray Cray or Murray Lobster is Australia's second largest freshwater crayfish and is widely distributed through the Murray River and many of it's tributaries. It is reputed to reach up to 3kg in weight, although such large crayfish are a rarity these days.
Murray Crayfish are the largest species of the Spiny Crayfish genus Euastacus and have long been a target of fisherman. Due to a considerable decline in their populations and the rarity of larger individuals, fishing for them is now banned in some areas and there are restrictions on when you can fish and how many and what size can be taken.
Although these are superficially similar to Yabbies, they have a very different life history and take a long time to reach maturity. The minimum legal OCL (eye socket to end of thorax length) is 10 cm and crayfish may take 9 –10 yeas to reach this size. A large individual may be 40 years old so please consider when catching them; they are best returned to the river. Their smaller more numerous cousins – the Yabbie (Cherax destructor) – on the other hand, reach maturity in around a year so are much more suited to being harvested for the pot!
The crayfish in this video were filmed in the upper reaches of the Goulburn River catchment in a high energy cool water environment. I spent 30 minutes snorkelling in the river to try and get this footage; the video shows 3 crays, the older one first (although still quite young) with white claws (chelae) and a couple of younger ones, one missing one of its chelae. During that time in the river I saw no native fish but numerous introduced Brown Trout, one of which is shown briefly in the video.
中文出處 :余小蝦
Euastacus armatus 白惡鏽多刺螯蝦
俗稱：Murray crayfish、Murray River crayfish、Murray spiny crayfish、穆瑞河小龍蝦、穆瑞多刺螯蝦、白惡鏽多刺螯蝦
拉丁學名：Euastacus armatus
原產地：澳洲東南部、新南威爾斯州、維多利亞州
棲息地：溪流、湖泊
身長：25公分～50公分
壽命：20～50年
體色：白色雙螯、體色呈深綠色、紅色、棕色、藍色、灰色、黑色等變化
食物：雜食性、可餵食蝦糧、紅蟲、半腐爛的木頭、植物為食、生物屍體、水棲軟體生物
飼養溫度：18℃～?℃，不耐高溫
總硬度：10∘dGH
酸鹼度：7.0～8.5 pH
溶氧量需求：6.8（1/mg）
最佳溶氧量：>9（1/mg）
重量:3000克3公斤
海拔:700米
飼養難度：★★★★★☆
珍稀度：★★★★★★
繁殖難度：★★★★★☆
