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May 23, 2013

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United States

Texas— Growth Curves for Genetically Selected High Growth Lines of Litopenaeus vannamei

 

 

From Abstract: There are no reported growth curves for the new genetically selected high growth lines of Penaeus vannamei.  This paper reports accurate growth curves for genetically selected high growth lines of the Pacific white shrimp, P. vannamei (obtained from Shrimp Improvement System, Inc. also see SIS Management Team) from 0.003 grams to over 20 grams, with special emphasis on postlarvae from 0.003 grams to two grams.  Without accurate growth curves, accurate feeding tables cannot be generated.  Without accurate feeding tables, overfeeding, feed waste and pollution are possible.

 

The salinities and temperatures for which the growth curves were generated were 26 to 32 parts per thousand and 28º to 31ºC.  The growth curves were obtained for both reduced water exchange with biofloc and clear water using recirculating aquaculture systems.  Feed rates were adjusted to be above satiation for the stocking densities and survival for the indoor research facilities at the Texas AgriLife Research Mariculture Laboratory at Port Aransas, Texas, USA.  For initial stocking densities of 20,000 to 40,000/m3 and postlarvae (PL) ten to twelve days old weighing 0.002 to 0.004 grams, PL weight two weeks later was 0.12 to 0.18 grams.  Two weeks later at 38 to 40 days old, PLs with an initial stocking density of 5,000 to 10,000/m3 weighed 0.5 to 0.8 grams.  The reported growth curves for these sizes represent three weighings per week.

 

Starting with a 0.2-gram shrimp, exponential growth continued for 3.5 to 4.0 weeks or until the shrimp were 4.0 to 5.0 grams at a stocking density of 350/m3.  Linear growth of 2.5 to 3.0 grams per week with an average growth rate of 2.76 grams  per week was obtained to a final size of 21.8 grams.  The reported growth curves for these sizes represent one weighing per week.

 

From these growth curves and with the knowledge of the FCR for the feed used an accurate feed rate can be determined.

 

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).  Growth Curves and Feed Curves for the New Genetically Selected High Growth Lines for the Pacific White Shrimp Litopenaeus vannamei.  Addison Lee Lawrence (smpall@yahoo.com), Frank Castille and Jack Crocket (Texas AgriLife Research Mariculture Laboratory, Texas A&M University System, Port Aransas, Texas 78373, USA).  February 2013.

 

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