Chronic stress due to high stocking density in open sea cage farming induces variation in biochemical and immunological functions in Asian seabass (Lates calcarifer,Bloch)

Stocking density is an important factor in cage aquaculture of finfish. Effects of high stocking density (35 fish cubic m^?1) on a range of biochemical and immunological parameters in Asian seabass reared in open sea floating net cages were compared to fish held in relatively low density (15 fish cubic m^?1). The results revealed that chronic stress due to high stocking density induced variations in most of the parameters studied as evidenced by increased cortisol and glucose levels and decreased activity of lysozyme, myeloperoxidase and complement. Production of reactive oxygen species, total leucocyte count and total serum protein were also decreased, whereas anti-protease, alkaline phosphatase and acid phosphatase activities were increased in high stocking-density group when compared to low stocking-density group. Effects of chronic stress due to high stocking density were discussed in relation to variations in these parameters.     

Effect of pretreatment of stock plants of mango with cycocel, ethrel and morphactin on the rooting of cuttings and air layers

07121978

Abstract

Pretreatment of stock plants with cycocel or ethrel induced rooting on cuttings and air layers of mango (Mangifera indica L.), a difficult-to-root fruit plant which normally does not regenerate roots. Application of IBA to the cuttings and air layers made from pretreated shoots improved rooting, cycocel pretreatment being more effective than ethrel. Morphactin pretreatment inhibited rooting, fully counteracting the auxin-induced rooting.