Through the U.S. Marine Shrimp Farming Program (USMSFP), the Oceanic Institute (OI) has established a selective breeding program to improve the performance of specific pathogen free Pacific white shrimp, Litopenaeus vannamei. During the past year, representative shrimp from 80 full-sib families were stocked in OI's 337-m2 round pond and 58-m2 recirculating raceway for growout comparisons at a stocking density of 200 shrimp/m2. Of the 80 families that were evaluated, 60 families were selected 100% for growth, 15 families were unselected control families, and 5 families were inbred lines to evaluate inbreeding depression. After 14.5 weeks, shrimp in the round pond exhibited a mean harvest weight of 20.0 g + 4.4 (SD) and harvest weight ranged from 4.9 - 33.9 g. Mean survival was 75.5% + 17.9 (SD) and family survival ranged from 45 - 100%. After 16 weeks, shrimp in the recirculating raceway exhibited a mean harvest weight of 22.8 g + 4.6 (SD) and harvest weight ranged from 10.7 - 41.1 g. Mean survival was 72.6% + 11.7 (SD) and family survival ranged from 45 - 100% (Table 1).

Table 1. Weight gain (g), survival (%), and realized response to selection (% gain) of shrimp reared in OI's round pond (RP) and recirculating raceway (RR). 

In addition to growout evaluations, families of L. vannamei that were selected for resistance to Taura Syndrome Virus (TSV) were challenged with TSV at the Gulf Coast Research Laboratory (GCRL) in Mississippi and at the University of Arizona (UAZ). Mean survival of representative shrimp from 79 full-sib families to TSV at GCRL was 38% and survival ranged from 8.3 - 81.3%. Mean survival of representative shrimp from 24 full-sib families to TSV at UAZ was 32.9% and survival ranged from 0 - 76.2%. There was a significant positive relationship between mean family survival to TSV between GCRL and UAZ (P < 0.001, r2 = 0.51, n = 24).

In addition to shrimp research, OI worked jointly with UAZ over the past year to diversify the germplasm of the breeding program by developing new candidate SPF shrimp stocks from Panama. To date, six maternal families of F1 Panamanian juvenile L. vannamei are being maintained at OI\'s secondary quarantine facility with the expectation that they will be included into the breeding program during the next year. Also, OI has supported the U.S. shrimp farming industry by providing shrimp to research institutions and the commercial sector. During the past year, 123,139 postlarvae, juvenile, and broodstock shrimp were distributed throughout the U.S. In addition, 274,500 sentinel shrimp were provided to USMSFP Consortium institutions and private farms for disease-related research and for biosecurity purposes.