Effects of Salinity on Some Haematological and Biochemical Parameters in Nile Tilapia, <i>Oreochromus niloticus</i>

Abstract

Any change in haematological and biochemical parameters could be a predictor of unfavorable environment or effect of different stress factors. The present study was designed to assess different salinity concentration induced changes in some haematological and biochemical parameters in 64 O. niloticus fishes captured from Manzala Lake (Egypt), they were acclimatized and fed with commercial fish diet for one week before starting the experiment for another 2 weeks. Fishes were divided into 4 equal groups assigned as; control, 4g NaCl\L, 8 g NaCl\L and 12 g NaCl\L. RBCs, HCT, Hb concentration, platelets count, superoxide dismutase activity, catalase activity, potassium level and serum total protein were estimated. The HCT, Hb concentration, platelets count and potassium levels were significantly higher in (4gNaCl\L, 8gNaCl\L and12gNaCl\L, respectively). The Superoxide dismutase activity (SOD), total protein, RBCs and catalase activit were significantly lower in (4gNaCl\L, 8g NaCl\L and 12gNaCl\L, respectively) compared to the control group. Other parameters such as WBCs, haematimetric indices (MCV, MCH, MCHC), malonedialdhyde (MDA) level, carbonyl protein (CP), glutathione reductase (GR) activity, as well as serum sodium, glucose, cortisol and IgM, did not show any significant differences in the estimated salinity concentrations.

Striped catfish ( Pangasianodon hypophthalmus ) could be suitable for coastal aquaculture

“…Interestingly, results of the current study showed an increase in WBC in the highest salinity treatment (12‰) in the initial days of exposure indicated that the striped catfish undergo stress due to high salinity. Similar results were reported in Nile tilapia, Oreochromus niloticus (Naglaa et al, 2017), rainbow trout, Oncorhynchus mykiss (Sahafi, Masaeli, Alizadeh, Negarestan, & Naji, 2013), and silver barb, Barbonymus gonionotus (Amin et al, 2016) when placed in saline/brackish water.…”

“…Such an increase may be due to enhanced gluconeogenesis response of stressed fish in their attempt to satisfy their new energy demands (Winkaler, Santos, Joaquim, Machado-Neto, & Martinez, 2007). Dissimilar results were found in Nile tilapia, O. niloticus placed in high salinity levels showed lower glucose concentration (Naglaa et al, 2017).…”

“…In the present study, Hb and RBCs decreased, and WBCs increased in higher salinity (8 and 12‰). Naglaa, Mohammed, Gamal, and Rajab (2017) reported a decrease in both Hb content and RBCs at 8 and 12‰ salinity levels in Nile tilapia. These changes of hematological parameters may be related to osmoregulatory dysfunction caused by high salinity levels (Fazio, Marafioti, Arfuso, Piccione, & Faggio, 2013).…”

A data‐independent acquisition (DIA) assay library for quantitation of environmental effects on the kidney proteome of Oreochromis niloticus

“…Three different GST isoforms are connected in network 1 to another highly regulated protein, elongation factor 1-delta (FC = 4.48, p = .0025). EF 1-delta was found to be regulated in several studies of fish exposed to pollutants (Jeffries et al, 2015;Williams et al, 2003) and putative disease agents (Lü et al, 2014), as well as hypo-osmotic stress in shrimp (Liu et al, 2016 (Elarabany et al, 2017). Osmotic stress is known to induce erythrocyte cell death by opening Ca 2+ -permeable cation channels, increasing cytosolic Ca 2+ activity and triggering erythrocyte apoptosis (Lang et al, 2003).…”

Comparative and Interactive Biochemical Effects of Sub-Lethal Concentrations of Cadmium and Lead on Some Tissues of the African Catfish (Clarias gariepinus)

“…Physiological changes in Freshwater fishes are widely used as a biomarker of any stressor component in the aquatic environment (11,12). The changes in activities of antioxidants enzymes (SOD, CAT, G-6-PDH and LDH), glutathione level and lipid peroxidation product could be used as a biomarker of water pollution.…”