Growth and Survival of Penaeus monodon (Fabricius, 1798) in Monosex and Mixed-sex Cultures
Growth and Survival of Penaeus monodon (Fabricius, 1798) in Monosex and Mixed-sex Cultures
Date
2014
Authors
Bajaniya, Viral Chhaganlal
Nair, C. Mohanakumaran
Salin, K.R
Tank, Ketan Vallabhdas
Journal Title
Journal ISSN
Volume Title
Publisher
Society of Fisheries Technologists (India)Cochin
Abstract
Sexual dimorphism is apparent in black tiger shrimp
Penaeus monodon (Fabricius, 1798) with females
achieving larger size than males. An experiment was
conducted to compare rearing of all female and all
male P. monodon with a mixed-sex population using
juveniles segregated by hand-sexing. External sex
differentiation of postlarvae started after 55 – 60
days of rearing when they reached 2.5 g and 7.0 cm
size. Healthy juveniles (4.46 ± 0.54 g; 8.55 ± 0.30 cm
for males and 4.35 ± 0.38 g; 8.54 ± 0.20 cm for
females) were stocked in 250 l circular cement tanks
with water of salinity 18 ± 2 g l-1 at a density of 8
individuals per tank (equivalent to a density of 12.5
m-2). The treatments were all male, all female, and
mixed-sex juveniles at a ratio of 1:1, with five
replicates in each one. The animals were fed with
a commercial shrimp starter feed for 50 days. All
female shrimps attained significantly higher growth
of 40% and 43% compared to all male and mixedsex
treatments, respectively, with greater specific
growth rate and protein efficiency ratio, and lower
feed conversion ratio (p<0.05). Survival rates were
not significantly different among treatments. The
male growth in the all male and mixed sex
treatments was similar, while the female growth was
significantly higher in the all female treatment
compared to that in the mixed sex treatment. Results
of this study demonstrate the benefit of all female
culture of P. monodon over the conventional mixedsex
culture although more trials are recommended
to establish its commercial attributes.
Description
Keywords
Monosex culture, mixed-sex culture, Penaeus monodon, sex differentiation, sexual dimorphism, survival rate
Citation
Fishery Tech 51(1):13-18