Application of Antioxidant Enzymes as Biomarkers in Cultivability Assessment of Palaemonid Shrimps
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The scope of the study was to explore and simulate some selected abiotic factors from the natural
home of the shrimps (a tropical rainforest river) with a view to providing information required for
sustainable shrimp husbandry.
Hypothesis: Abundance of shrimps is solely a function of the physico-chemical (abiotic)
characteristics of the river.
Methodology: Water, sediment and shrimp samples were collected on monthly basis from the Osse
River, in Edo State, Nigeria. The samples were collected between April and December, 2015; at
night and early morning periods. The physico-chemical properties of the water and sediment
samples were analyzed in the laboratory. The sAnalysis of variance was employed in analyzing the descriptive statistics of the physico-chemical
properties. Sex distribution patterns amongst the shrimp species and the ratio of male to female
distribution for each species was analyzed mathematically. Stress levels impacted by abiotic
variables were investigated employing Cytochrome P450 mono-oxygenase (CYP450), Glutathione-
S-Transferase (GST), Catalase (CAT), Superoxide dismutase (SOD) and Lipid Peroxide (LPO).
Results: Availability of the shrimps in the study area was: Macrobrachium vollenhovenii
>Macrobrachium macrobrachion >Macrobrachium lux >Macrobrachium fellicinium
>Nematopalaemon hastatus > Palaemon maculatus. The female shrimps outnumbered the males in
among all the species captured from the natural environment. Order of abundance of shrimps in the
river was Station 2 (41%) > Station 1 (32%) > Station 3 (16%) > Station 4 (11%).Abundance of
shrimps at Station 2 can be attributed to the predominant abiotic factors such as flow rate (0.1 ±
0.01 m/s), depth (72.5 ± 3.1 cm, water pH (6.7- 7.5), water temperature (27.6 ± 1.07 °C), and
primary productivity nutrients (oligotrophic). Laboratory results conform to field observations on the
basis of depth having greater impacts on the organisms than flow rate.
Conclusion: Palaemonid shrimps are littoral organisms which have considerable cultivability. Depth
of 72 cm and flow rate of 0.1 m/s are recommended for aquaculture of the shrimps. Notwithstanding,
sufficient information about their feeding habits and breeding conditions are imperative.hrimp samples were identified, sorted, and counted.
Keywords
QH Natural history, QH301 Biology, QL Zoology