多謝Decapoda資料。
好彩之前補飛加多句話可能係日本絨螯蟹。
因為未試過真係將兩種蟹的活體或標本作比較, 所以我唔識點分兩種蟹。
不過查過資料, 香港確是有中華絨螯蟹。
“The Chinese Mitten Crab Eriocheir sinensis is found in small numbers in our
local streams. It migrates downstream to the sea to spawn every autumn and
the juvenile crabs actively go upstream a couple of months later.”
WWF(HK)的Hong Kong’s Migratory Animals Factsheet No.6:”
http://www.wwf.org.hk/eng/pdf/re ... eets/factsheet6.PDF
渠務署於2000 年及2001年做的西貢Stormwater Drainage Master Plan的EIA中更提及幾個發現地點：
“Freshwater shrimps, especially Caridina cantonensis were abundant and dominated at Sai Kung River.
Dipteran larvae, mainly Orthorcladinae, were more numerous in Pak Kong and Ho Chung River than at Sai Kung River.
Common stream benthos included the snail Brotia hainanensis, Long Armed Shrimp Macrobrachium hainanense,
and Mitten Crab Eriocheir sinensis, with all three species recorded in Sai Kung, Pak Kong and Ho Chung Rivers.”
http://sc.info.gov.hk/gb/www.epd ... port/html/chap1.htm
即西貢北港、蠔涌的及西貢河都發現有野生大閘蟹（中華絨螯蟹），
唔知係咪有人在運送大閘蟹時倒瀉籮蟹而令大閘蟹留港發展。
中國的大閘蟹早已入侵歐美湖泊河流，成為嚴重破壞當地生態的入侵種，
部份留港落地生根也是不奇怪了。
還是中國東南沿岸，包括香港根本就是牠們自然分佈地區之一，
只是香港沒有太多的合適棲地，所以數目很少呢？
這篇『土壞對中華絨螯蟹穴洞影響』研究的文章便提及香港是中華絨螯蟹土生分佈地之一：
“The Chinese mitten crab, Eriocheir sinensis, is native to Asia and invasive worldwide.
The native range of the crab extends along the West Coast of North Korea to Hong Kong
and throughout the tributaries of the rivers draining into this region (Panning 1938).”
The Effects of Substrate on the Burrow Morphology of the Chinese Mitten Crab
Valerie Chan
http://socrates.berkeley.edu/~es196/projects/2002final/Chan.pdf
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