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Title: Performance of WSSV-infected and WSSV-negative Penaeus monodon postlarvae in culture ponds.
Authors: Shao-En Peng;Chu-Fang Lo;San-Ching Lin;Li-Li Chen;Yun-Shiang Chang;Kuan-Fu Liu;Mao-Sen Su;Guang-Hsiung Kou
Contributors: 國立臺灣海洋大學:生命科學系
Date: 2001
Issue Date: 2018-03-28T03:06:36Z
Publisher: Diseases of Aquatic Organisms
Abstract: Abstract: In a survey of 27 Penaeus monodon culture ponds stocked with postlarvae (~PL10) at medium density (~40 shrimp m-2), single-step nested white spot syndrome virus (WSSV) PCR was used to measure the WSSV infection rates in the shrimp populations within 1 mo after stocking. Seven ponds were initially WSSV-free, and the shrimp in 5 of these were harvested successfully. In the ponds (n = 6) where detection rates were higher than 50%, mass mortality occurred during the growth period, and none of these ponds was harvested successfully. In a subsequent study, P. monodon brooders were classified into 3 groups according to their WSSV infection status before and after spawning: brooders that were WSSV-positive before spawning were assigned to group A; spawners that became WSSV-positive only after spawning were assigned to group B; and group C consisted of brooders that were still WSSV-negative after spawning. WSSV screening showed that 75, 44 and 14%, respectively, of group A, B and C brooders produced nauplii that were WSSV-positive. Most (57%; 16/28) of the brooders in group A produced nauplii in which the WSSV prevalence was high (>50%).When a pond was stocked with high-prevalence nauplii from 1 of these group A brooders, an outbreak of white spot syndrome occurred within 3 wk and only ~20% of the initial population survived through to harvest (after 174 d). By contrast, 2 other ponds stocked with low-prevalence and WSSV-negative nauplii (derived respectively from 2 brooders in group B), both had much higher survival rates (70 to 80%) and yielded much larger (~3x by weight) total harvests. We conclude that testing the nauplii is an effective and practical screening strategy for commercially cultured P. monodon.
Relation: 46(30
Appears in Collections:[Department of Life Science] Periodical Articles

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