Comparison of ovarian maturation and spawning after unilateral eyestalk ablation of wild-caught and pond-reared Penaeus monodon

Weigeng Wen,Lihua Qiu,Qibin Yang,Zhenhua Ma,Jian G Qin,Jianhua Huang,Shigui Jiang,Falin Zhou

doi:10.5424/sjar/2015133-7860

Weigeng Wen, Lihua Qiu + Show 6 more

Open Access

https://doi.org/10.5424/sjar/2015133-7860

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Abstract

The present study compares the efficiency of ovarian maturation and spawning success between wild-caught and pond-reared Penaeus monodon females after unilateral eyestalk ablation. The earliest spawning time after eyestalk ablation was 5.9 days in wild-caught females, which is significantly shorter than the spawning time in pond-reared females (10.5 days). Both wild-caught and pond-reared females repeatedly spawned after eyestalk ablation. On average, each wild-caught female spawned 2.94 times while each pond-reared female spawned only 1.09 times. The spawning induction rate, egg hatching rate, and the number of eggs per spawning were significantly greater in wild-caught females than in pond-reared females. However, the egg size was not significantly different between wild-caught and pond-reared females. Four shrimp sizes (60, 80, 100 and 120 (± 1.0) g) were tested in this study and body weight significantly affected ovarian induction in pond-reared females but not in wild-caught females. Within the same body-weight class, the egg number per spawn in wild-caught females was significantly greater than that in pond-reared females. The egg production per spawn of the pond-reared females in the 120-g size group was two times higher than that in the pond-reared females in the 80-g size group. In conclusion, the fecundity of wild-caught P. monodon females is significantly higher than that of pond-reared P. monodon females. In breeding pond-reared P. monodon, the recommended minimum body weight of females is over 80 g, and the desirable body weight is over 100 g.

Highlights

In most shrimp hatcheries, larval shrimp production mainly relies on wild-caught broodstock (Palacios et al, 1999; Hall et al, 2003; Peixoto et al, 2003), but this practice constrains production efficiency as the availability of wild broodstock is seasonal. Coman et al (2006) suggested that domestication of major shrimp species would bring overall economic benefits to the shrimp aquaculture industry in the long term
The present study compares the efficiency of ovarian maturation and spawning success between wild-caught and pond-reared Penaeus monodon females after unilateral eyestalk ablation
In breeding pond-reared P. monodon, the recommended minimum body weight of females is over 80 g, and the desirable body weight is over 100 g

Summary

Introduction

Larval shrimp production mainly relies on wild-caught broodstock (Palacios et al, 1999; Hall et al, 2003; Peixoto et al, 2003), but this practice constrains production efficiency as the availability of wild broodstock is seasonal. Coman et al (2006) suggested that domestication of major shrimp species would bring overall economic benefits to the shrimp aquaculture industry in the long term. Larval shrimp production mainly relies on wild-caught broodstock (Palacios et al, 1999; Hall et al, 2003; Peixoto et al, 2003), but this practice constrains production efficiency as the availability of wild broodstock is seasonal. Hatchery production of shrimp seedlings requires a reliable source of gravid female shrimp. The source of a breeding female is unreliable in most commercial hatcheries due to seasonal variation and access limitation to broodstocks. The wild-caught females are likely to carry virus, which may increase the risk of failure in shrimp culture and breeding (Yang et al, 2011). To overcome the unreliability of wild broodstock supply and increase the production efficiency of P. monodon, the use of domesticated pathogen-free broodstock is necessary

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