Abstract
Background Length–weight relationships and condition factors of giant tiger shrimp Penaeus monodon (Fabricius, 1798) from four breeding families (family S: South China seas family, family A: African family, family SA: ♂ South China seas family × ♀ Africa family, family AS: ♂ Africa family × ♀ South China seas family) were evaluated in this study.Findings and conclusionLength–weight relationships can be expressed as W = 0.0239BL2.789 (R2 = 0.8977) in family S, W = 0.0206BL2.9107 (R2 = 0.9107) in family A, W = 0.0211BL2.831 (R2 = 0.8869) in family SA, and W = 0.0249BL2.781 (R2 = 0.9159) in family AS. The growth of P. monodon from four breeding families follows a negative allometric trend. Fulton’s body condition factor (K) was not significantly different in males, while in females, the highest K (3.07) was observed in family AS, and the lowest K was found in family A (1.88). Results from the present study indicate that the cross group family AS (♂ Africa family × ♀ South China seas family) has obvious heterosis in females. This may suggest that the direction of further breeding of P. monodon, should be conducted by using Africa family as male parent, and South China seas family as female parent. Results from the present study will provide valuable information on selective breeding in P. monodon. Methodology used in the present study can also be applied in other similar species.
Highlights
Length–weight relationships and condition factors of giant tiger shrimp Penaeus monodon (Fabricius, 1798) from four breeding families were evaluated in this study
Broodstocks cultivation and mating The broodstocks used in this study were wild shrimp collected from Mozambique Channel, Africa, and the coastline of Sanya City, People’s Republic of China
The environmental parameters were kept at 28–33 °C, 5–9 mg dissolved oxygen L−1, 28–35 ‰ salinity and 7.8–8.2 pH The broodstock were fed with a conditioning diet of fresh frozen squid and a clam worm (Nereis succinea)
Summary
Length–weight relationships and condition factors of giant tiger shrimp Penaeus monodon (Fabricius, 1798) from four breeding families (family S: South China seas family, family A: African family, family SA: ♂ South China seas family × ♀ Africa family, family AS: ♂ Africa family × ♀ South China seas family) were evaluated in this study. Fish farmers commonly use fish weight gain to evaluate profit gain and scientists usually adopt length measurements to assess fish growth performance in the field. LWR is a useful measure for body condition in selected species and to Fulton’s condition factor (K) is often used to quantify an animal’s physical wellbeing, and considered to be a useful complement for growth estimate in crustaceans (Rochet 2000). It is an important parameter for the management of culture systems (Araneda et al 2008).
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