Using decapsulated Artemia cysts as fry food.

I’ve made numerous diagnoses of newly hatched fry dying from starvation despite been given access to plenty of Artemia. The main reason for this is the capsule/shell of the cysts cause gut blockage. So, it is very important to separate the Artemia from their capsules.  If this proves difficult, there are means of decapsulating the cysts prior to trying to hatch them (e.g. using chlorine).

But what if your Artemia are of poor quality, having poor hatch rates? This article is interesting because it demonstrates that unhatched, decapsulated cysts can still provide good nutritional value once the fry are big enough to take them.

 

Aquaculture Research
  Volume 44, Number 2 (January 2013)
     Decapsulated Artemiacysts of different quality (high or low hatch-rate) as direct food for tench (Tinca tincaL.) larvae
   Authors: Jesús D. Celada, Vanesa García, José M. Carral, María Sáez-Royuela, Rocío González, Álvaro González
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   Source: Aquaculture Research, Volume 44, Number 2 (January 2013)
   Page Numbers: 167 – 175
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   Abstract: Three 30-day experiments were conducted to evaluate decapsulated Artemiacysts with different quality (high or low hatch-rate) as food for tench (Tinca tincaL.) larvae from the onset of exogenous feeding. In experiment 1, three diets were tested: Artemianauplii-only or cysts-only for 30 days, and nauplii for the first 7 days and cysts thereafter. The cysts used had 86% hatching rate (high hatch-rate cysts). The same feeding treatments were replicated in experiment 2 but with low hatch-rate cysts (10% hatching rate). In experiment 3, five diets were tested: high hatch-rate cysts only or low hatch-rate cysts only for 30 days, and nauplii for the first 7, 4 or 2 days and low hatch-rate cysts thereafter. In overall, survival was high, except with the low hatch-rate cysts only diet. Feeding tench larvae with cysts resulted in higher growth and lower FCRcompared to feeding with live nauplii only. High hatch-rate Artemiacysts are a suitable food from the onset of exogenous feeding and low hatch-rate cysts can be successfully used after 2–7 days feeding on nauplii.
   Citation: Jesús D. Celada, Vanesa García, José M. Carral, María Sáez-Royuela, Rocío González, Álvaro González . Decapsulated Artemiacysts of different quality (high or low hatch-rate) as direct food for tench (Tinca tincaL.) larvae. Aquaculture Research, Volume 44, Number 2 (January 2013), pp. 167-175, <http://ejournals.ebsco.com/direct.asp?ArticleID=4B8993597532109BC927&gt;
   URL: http://ejournals.ebsco.com/direct.asp?ArticleID=4B8993597532109BC927

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