RESUMEN
To date, the effects of lead on the growth and haematological parameters of milkfish are still not well understood. For this reason the present study seeks to explain this conundrum. Sub-adult female milkfish were exposed to four concentrations of lead nitrate (0 mg/l, 42.64 mg/l, 63.97 mg/l and 85.29 mg/l) for 40 days. Results revealed that exposure to lead nitrate caused significant changes in growth and haematological parameters of milkfish. Weight gain, length gain, specific growth rate, feed efficiency, and feed conversion ratio of milkfish declined significantly at the highest concentration treatment. Moreover, lead nitrate exposure significantly decreased the value of red blood cells, hemoglobin, hematocrit, and mean corpuscular hemoglobin concentration, along with a marked increase in mean corpuscular volume and mean corpuscular hemoglobin. Several erythrocyte malformations to cells including swelling, deformation, doubling, binucleus, laceration of the membrane, hemolyzation and vacuolation were all observed.
