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July 1, 2013

United States

Kentucky—Production of All-Male Freshwater Prawns

 

From Abstract: The giant Malaysian prawn (Macrobrachium rosenbergii)has attributes that make it attractive for aquaculture production including rapid growth, relatively low protein requirement, ability to be cultured inland away from the coast and high ratings in terms of environmental sustainability. Compared to marine shrimp species, however, freshwater prawn production per hectare is low, with large size variations at harvest.  Both of these attributes are affected by complex social and interactions within and between sexes.

 

Recently technologies have been developed to produce all-male juveniles on a commercial scale.  The present study was conducted to compare the production and population characteristics of mono-sex-male prawns with a normal mixed-sex population.  Juvenile prawns from each group were stocked into 0.04-hectare ponds at an individual weight of 0.37 grams, at 60,000 juveniles per hectare.  All ponds had artificial, vertical substrates.  Each treatment (mono-sex male and mixed-sex) was replicated in three ponds. Prawns were fed a commercial sinking pellet (32% protein) once daily at a standardized rate.  Dissolved oxygen (DO), temperature, and pH were monitored twice daily.  After 105 days of growout, prawns were harvested, bulk weighed, counted and a sample of 500 individuals per pond was individually weighted and morphotyped.

 

At harvest, survival of mixed-sex prawns (88%) was significantly greater than all males (74%) (P<0.05).  Total production of all-male prawns averaged 1,662 kilograms per hectare and mixed-sex prawns averaged 1,410 kg/ha. The difference was not significantly different (P>0.05).  Average weight of the all-male prawns (42.7 grams) was 43 % greater than mixed- sex prawns (30.4 grams).  This difference was statistically significant (P<0.05).  Morphotype data and size variation will be analyzed further.  Although differences in survival complicate interpretation, these data indicate that all-male prawns show potential to improve pond production of the freshwater prawn.

 

 

Source: The Thumb Drive Containing the Abstracts from Aquaculture 2013 (February 21-25, 2013, Nashville, Tennessee, USA).  Information: John Cooksey, World Aquaculture Conference Management, P.O. Box 2302, Valley Center, California 92082, USA (phone 1-760-751-5005, fax 1-760-751-5003, email worldaqua@aol.com). Production Comparison of All-Male and Mixed-Sex Freshwater Prawns Macrobrachium rosenbergii in Ponds.  James H. Tidwell (james.tidwell@kysu.edu, Aquaculture Research Center, Kentucky State University, Frankfort, Kentucky 40601, USA) Shawn D. Coyle, Leigh Anne Bright, Charles Shultz and Zachary Kupchinsky.  February 2013.

 

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