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SHRIMP, CRAYFIS H & CO.: Giant Yellow Shrimp


caridina English Edition - epaper ⋅ Ausgabe 1/2020 vom 04.03.2020

Some astonishingly large backline shrimp have come to our author’s attention


Artikelbild für den Artikel "SHRIMP, CRAYFIS H & CO.: Giant Yellow Shrimp" aus der Ausgabe 1/2020 von caridina English Edition. Dieses epaper sofort kaufen oder online lesen mit der Zeitschriften-Flatrate United Kiosk NEWS.

Bildquelle: caridina English Edition, Ausgabe 1/2020

Yellow Giant Shrimps in an aquarium, ruler shows centimeters.


Winning shrimp bred by Anna Martson.


Photo: Marian Scheffner

During the “Koi und Aquaristik“ trade show I was surprised to see gigantic yellow Neocaridina in one of the show tanks. They were almost double the size of a standard specimen of this color morph. Some shrimpers called them “Big Mama”. All of a sudden, my own yellow shrimp came to mind. Those were sitting in one of my tanks at home, ...

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... more or less disregarded, as I was keeping them only for crossbreeding experiments with another morph.

However, they were absolutely uncooperative, and the females in the little group of around ten never carried eggs even once, despite the presence of male shrimp.

I had gotten the original group around two years before from an aquarium friend from Bochum, Germany. According to literature, these shrimp had supposedly reached the end of their lifespan by the present time.

Back at home I wanted to have a closer look at my yellow shrimp, and I started cleaning up the Yellow Fire tank. Under a heap of Najas and Fontinalis I found the stubborn yellow critters that had only rarely ventured out to parade along the aquarium glass. There were some yellow giants in my tank alright! Quickly I caught them and put them into my new photo tank.

GIGANTIC SHRIMP

I held a ruler in front of and behind the photo tank, but I couldn’t determine their size precisely. Taking the shrimp out of the water and putting them onto the ruler seemed a bit risky, so I chose to carefully shoo one of the larger females towards the front, where I could finally measure her: she was just under 3.5 cm (1.4 in), from rostrum to tail fan!

Since I hadn’t paid attention who bred the giant yellow shrimp shown at the “Koi und Aquaristik“, I inquired with one of the organizers, Thorsten Lippert, and he told me they were entered in the contest by Anna Martson from the shop Garnelen- Bremen. I asked her to measure her “Big Mamas“, and she informed me that the largest of them had a proud 4.3 cm (1.7 in) in length.

When I was pondering the facts, I suddenly remembered a discussion I had had several years ago. Back then, I was also mesmerized by some really huge Neocaridina I had spotted - an all-female group in one of my conversation partner’s aquariums.

He explained that female shrimp might grow to truly amazing sizes if you separated them early on so they would never get berried. In this case, they’d put all their energy into growth instead of reproduction.

CONSEQUENCES FOR BREEDING?

I haven’t found a scientific explanation why these shrimp grow so much larger than the standard 2-2.5 cm (0.8-1 in). My guess would be that they may live longer if they grow up almost free from stress in a dedicated tank, just as we know from some fish. Then they have more time to grow and to develop this unique feature.

Whether this phenomenon will have an impact on shrimp breeding at all, and whether we will get to see more of these titanic shrimp during the next championships and contests or on social media, is still very much in the dark. After all, the shrimp in my tank took around two years to grow to such an impressive size. I keep my yellow girls at cozy room temperatures, between 19 and a maximum of 26 °C during the summer (66 to 79 °F).

In any case, size does matter, and this craze is really interesting. I’m looking forward to seeing your gigantic Neocaridina - surprise me!