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珊瑚缸大扫除,清除螺类计划

2018-11-29 18:00| 发布者: admin| 查看: 15| 评论: 0


 

从我们开始开缸的那一天,各种螺就成为了缸里的一大要害,索性现在技术的进步能让我们把这类恼人的生物赶出我们的珊瑚缸。这些螺看起来像管虫,其实他们是一种躲在壳里的蜗牛,通常都藏在活石或者珊瑚骨里。

 

由于这类螺无法移动,所以它们采用一种非常讨厌的滤食方式来获取食物。漂亮的圣诞管虫伸展出它们惊艳绝伦的羽毛触手从水流中过滤食物,而螺类则是分泌粘液做成一张网来猎食。

 

在广袤的海洋中这种猎食方式本来也无妨,但是在珊瑚缸里,这张粘网却给它的邻居造成了极大的困扰。最令人担忧的是蠕虫蜗牛形成的黏液网刺激了它们周围的珊瑚,导致珊瑚缩毛和脱皮。


图中可以看出这类螺如果制造出了一张足够大的网,那么这张网可能勒死珊瑚

 

 

这意味着如果这些螺群体越来越大,那么珊瑚将停止生长并死亡。显而易见,如果珊瑚缸中有一大群螺类,那么它们产生的难看的粘液网会轻而易举的勒死珊瑚断肢,同时,这些粘液网也阻碍了食藻鱼类的正常猎食,并抑制藻类生长。

 

现在我们大致了解这类螺的危害,一项新的研究提供了令人信服的证据,证明我们应该尽一切可能将它们排除在我们的珊瑚缸之外。珊瑚礁生态学家称之为珊瑚的敌人,最近,在茉莉雅群岛一种大型的螺灭绝了,这让研究人员有机会看到它们的消失对珊瑚生长和健康的影响。

 

简单的说,这类螺的多少与周遭珊瑚的健康程度成正比,周围没有或者极少有螺的珊瑚礁珊瑚状况都非常健康。

 

所以,这个故事告诉我们,如果你在缸中看到这类螺,请把它们清除,同时检查加入缸中珊瑚和贝类。不幸的是,在高营养盐的珊瑚缸里,这个物种会不断地尽情繁殖。它们的幼体非常非常小,难以发现,而且还爱躲藏在活石,水泵,或者其他水族器材中。

 

最原始的办法就是用针来戳死它们,或者用强力胶把它们的洞穴给封死。当然,尖吻尖鼻鲀可能会吃掉它们,注意,这种鱼同样也吃其他甲壳类动物和软体动物。

原文:

We’ve hated vermetids for as long as we’ve been reefing, and now science has given us the last nail in the coffin for this unwanted aquarium critter. Although they look like tubeworms, vermetids are actual a kind of snail which grows its shell in place – either on rocks or inside coral skeletons. 

 

 

Since they can’t move around, vermetid snails instead employ a unique by annoying form of filter feeding. Unlike beautiful Christmas Tree Worms which use their colorful gills to filter food from passing water, vermetids use a net made of sticky slime. 

 

 

In a vacuum there’s no harm to vermetid snails’ unique life style but on the reef and the reef aquarium, this slime net is a big problem for their neighbors. Most alarming is how the slime net of vermetid snails irritates the corals they often grow in and around, causing polyps to remain retracted and instigating tissue loss. 

 

This means that where vermetids are growing and abundant, corals die back and the reef looses its ability to grow. This is readily apparent in the home aquarium when one large vermetid or a cluster of small ones can easily smother coral frags with their unsightly slime nets. It has also been shown that these slime nets are a deterrent to algae grazing fish, preventing them from cleaning real estate on the reef, and encouraging algae growth in the home aquarium. 

 

Instinctually we always knew these little slimeballs are bad for corals, but a new study has offered convincing proof that we should do everything we can to exclude them from our reef tanks. Described by coral reef ecologists as ‘Coral Antagonists’, a recent die-off of a large species of Vermetids in Moorea gave researchers a chance to see the effect of their absence on coral growth and health. 

 

Simply put, there was a direct positive (=bad) association between the number of vermetids in or near a coral, and the number of lesions that the coral showed. Corals with fewer or no vermetids in their vicinity were healthy and mostly devoid of any lesions or tissue recession. 

 

So the moral of the story is that you should remove vermetids from the aquarium if you see them, remove them from corals and clams added to the aquarium, and generally go on the offense against this slimy pest. Unfortunately, in our high nutrient reef tanks certain species of vermetids can reproduce in aquariums, and the small offspring often lodge themselves in inaccessible places, inside the rock, the sump, and various pieces of reef aquarium gear. 

 

The first line of defense is to mechanically remove them, spear them, or in some cases you might be able to simply super glue their trapdoor shut. We’ve also wondered about the potential to ‘train’ small Canthigaster sharpnose puffers to eat vermetid snails, but you also have to be mindful about what else they might prey upon like other molluscs and crustaceans. 

 

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