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【后海灣一分鐘】六、荒廢魚塘荒而不廢?這裡會發生甚麼事?

2019/3/11 — 14:17

荒廢魚塘泛指沒有人管理的魚塘。這些魚塘不會再有降水的操作,反而會被雨水注滿;一些塘壆缺乏管理及維修,魚塘水位可能會受潮汐漲退影響。塘壆及塘內的植被亦因為乏人管理而叢生。有人認為荒廢的魚塘生態價值較低,但事實上,荒廢魚塘的生境也有很多種,其差異很多時候取決於荒廢時間的長短,以及魚塘周邊的生態環境。

政府 1997 年的魚塘研究報告早已提出,相對於運作中的魚塘,荒廢魚塘擁有較多蘆葦及露出水面的植物。南生圍魚塘雖然已荒廢了二十多年,但卻仍然孕育大量蘆葦,2011年更有顧問報告評核該區的蘆葦床面積乃是全港數一數二。蘆葦床為不少具保育價值的野生動物提供覓食及棲息地,包括受本地關注的黃葦鳽、受區域關注的中華攀雀,以及全球近危的歐亞水獺。因此,荒廢魚塘的生境特徵與運作中的魚塘不同,其生態功能亦不容忽視。

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【Deep Bay in a Minute】6. What happens in the abandoned fishponds? 

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Abandoned fishponds generally mean fishponds without active human management. There will not be any drain-down regime at the fishponds but instead will become rain fed. The lack of fishpond bund maintenance may cause the fishpond to become subject to tidal influence. There will be no control over bund and emergent vegetation in the fishpond. Some people may think abandoned fishponds are of lower ecological value. Yet, habitats of abandoned fishponds vary a lot and depend on factors including the time of abandonment and the surrounding ecological environment. 

The Government’s 1997 Fishpond Study recorded overall higher percentage of reed and emergent vegetation coverage in abandoned fishponds than in operating ones. It also recorded more species of ducks use abandoned fishponds during the winter. Even though some of the fishponds in Nam Sang Wai were inactive for decades and were gradually overgrown with reeds, a consultancy assessment in 2011 commented that it is one of the largest area of reed habitat in Hong Kong. The reedbed provide suitable foraging and roosting habitat for various wildlife of conservation concern, including Yellow Bittern of local concern, Chinese Penduline Tit of regional concern, and the globally near threatened Eurasian Otter. Therefore, abandoned fishponds have different habitat characteristics from operating ones and their ecological functions should not be overlooked. 

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