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Unknown Freshwater Shrimp

Started by Guest_theK_* , Sep 30 2009 06:52 PM

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9 replies to this topic

#1 Guest_theK_*

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Posted 30 September 2009 - 06:52 PM

i cant think of anywhere else that could give me correct answers to this question besides hear so.... i was wondering if anyone know why type of shrimp this shrimp is Posted Image

it was caught in the San Joaquin river and that one was one of the bigger ones... looks kind of like regular ghost shrimp but its a lot bigger and it has reddish dots all over their bodies... i did find a site about some American Freshwater Glass Shrimp but im not sure if it is or not so i was wondering if anyone here knew what type of shrimp they were. tanks

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#2 Guest_catfish_hunter_*

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Posted 30 September 2009 - 10:39 PM

It could be a nonnative shrimp, what does it eat? Also, does it swim often or crawl across the bottom more often?

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#3 Guest_Ouassous_*

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Posted 01 October 2009 - 01:46 AM

A mostly estuarine East Asian shrimp, Palaemon macrodactylus, has been introduced in your area. Do you know the approximate salinity of the water it was collected in?

I'm not familiar enough with how P. macrodactylus looks to say that this ID's a sure bet, but I'm quite sure that your shrimp is non-native.

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#4 Guest_theK_*

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Posted 02 October 2009 - 01:38 PM

It could be a nonnative shrimp, what does it eat? Also, does it swim often or crawl across the bottom more often?

i usually see them swimming around the fish tank and don't usually see them crawling around that much i have had other people tell me there just common grass shrimp and i caught them in the San Joaquin river pretty far from the bay area (about 3 hour drive away)but i think that river might b connected to the bay not sure... all i know is that its a fresh water river
Posted Image

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#5 Guest_gzeiger_*

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Posted 02 October 2009 - 07:05 PM

It's definitely not what I would call a "common grass shrimp" (Palaemoetes paludosus, which is probably what you've seen offered as ghost shrimp in stores), but if that name just came from the local fishermen it's been well noted that most people look at nongame fish and invertebrates in terms of size grades (bluegill bait, bass bait, catfish bait) rather than species. The three-part extension of shell forward of the eyes is not there in P. paludosus. It also doesn't appear to be a Macrobrachium species based on the lack of large pincers, although it's possible that this is still a small specimen that will develop claws later.

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#6 Guest_theK_*

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Posted 02 October 2009 - 08:45 PM

they all have claws but its just barely bigger then their legs and the biggest of these shrimps i have seen are about 2 1/2 inches only. also the pix of the ones in the pix are a little past 2 inches

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#7 Guest_Ouassous_*

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Posted 02 October 2009 - 08:51 PM

I don't know why I overlooked it the first time, but I think I've got it:

Exopalaemon modestus, the "Siberian prawn" (known also from Manchuria, Korea, China, and Taiwan -- definitely a non-native). The records page indicates some collection reports from the San Joaquin.

Some photos of a berried female for comparison: http://www.yafish.co.../data_6464.html

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#8 Guest_theK_*

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Posted 02 October 2009 - 09:58 PM

thanks im convinced that i have some Siberian prawns

Edited by theK, 02 October 2009 - 10:00 PM.

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#9 Guest_theK_*

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Posted 03 October 2009 - 03:57 AM

i was wondering since its nonnative to California do you guys think i would ever get in trouble if i was to go back and get more?? wouldnt i be helping the environment by removing this invasive shrimp/prawn?

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#10 Guest_gzeiger_*

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Posted 03 October 2009 - 09:24 AM

I'd be surprised if there was any impact on the overall environment from collecting a few individuals, but I would say go ahead and take what you want for your tank. Some places do have laws prohibiting possession of (live) invasive species, but I don't know what the law is on these in your area. California in general is pretty strict about lots of things. Such laws are intended to prevent the introduction of an invasive into new areas, particularly as bait. The outright ban on possession is an artifact of the difficulty in enforcement and doesn't reflect any ethical problem with you having them in your home tank, provided you never release anything back into the wild.