2.6. Effects of 5-HT and DA on Vg levels
Female prawns at ovarian stage I were divided into six groups
(four experimental groups and two control groups) of 28 animals
each. Prawns in the experimental groups were injected with 5-
HT at doses of 2.5 106, 2.5 107 mol of 5-HT/prawn or DA at
doses of 2.5 106, 2.5 107 mol of DA/prawn. 5-HT and DA
were dissolved in crustacean physiological saline (CPS) containing
the following: NaCl 29 g, KCl 0.71 g, CaCl2 2H2O 2.38 g,
MgSO4 7H2O 3.16 g, NaHCO3 0.5 g, MgCl2 6H2O 0.17 g, HEPES
4.76 g in 1 l of distilled water. The injected volumes of 5-HT and
DA were 0.10 ml. All prawns tolerated the injected doses of neurotransmitters
without showing any abnormal behavior. All injections
were performed at 4-day intervals, covering a period of 49
days. The effects of the neurotransmitter-treated groups were
compared with two control groups of 28 animals each. In the first
control group, the animals were untreated and served as a negative
control (NC). The second control group was a vehicle-injected control
(VIC) in which each animal was injected with 0.1 ml of CPS.
Animals in each group were identified by tying plastic loops of different
colors around the eyestalk. The injections were performed
by intramuscular route at the lateral aspect of the second abdominal
segment by using a 1 ml syringe (NIPRO) fitted with 26G 12
”
(0.45 12 mm) thin-wall needles (NIPRO). The weight and total
length of the prawns were measured on every treatment day, before
injection. The total length was evaluated from the base of eyestalk
to the telson (Eyestalk base-telson length, EBTL).
The hemolymph of treated and control prawns was collected
from the substernal hemolymph sinus at 4-day intervals. Each
2.6. Effects of 5-HT and DA on Vg levelsFemale prawns at ovarian stage I were divided into six groups(four experimental groups and two control groups) of 28 animalseach. Prawns in the experimental groups were injected with 5-HT at doses of 2.5 106, 2.5 107 mol of 5-HT/prawn or DA atdoses of 2.5 106, 2.5 107 mol of DA/prawn. 5-HT and DAwere dissolved in crustacean physiological saline (CPS) containingthe following: NaCl 29 g, KCl 0.71 g, CaCl2 2H2O 2.38 g,MgSO4 7H2O 3.16 g, NaHCO3 0.5 g, MgCl2 6H2O 0.17 g, HEPES4.76 g in 1 l of distilled water. The injected volumes of 5-HT andDA were 0.10 ml. All prawns tolerated the injected doses of neurotransmitterswithout showing any abnormal behavior. All injectionswere performed at 4-day intervals, covering a period of 49days. The effects of the neurotransmitter-treated groups werecompared with two control groups of 28 animals each. In the firstcontrol group, the animals were untreated and served as a negativecontrol (NC). The second control group was a vehicle-injected control(VIC) in which each animal was injected with 0.1 ml of CPS.Animals in each group were identified by tying plastic loops of differentcolors around the eyestalk. The injections were performedby intramuscular route at the lateral aspect of the second abdominalsegment by using a 1 ml syringe (NIPRO) fitted with 26G 12”(0.45 12 mm) thin-wall needles (NIPRO). The weight and totallength of the prawns were measured on every treatment day, beforeinjection. The total length was evaluated from the base of eyestalkto the telson (Eyestalk base-telson length, EBTL).The hemolymph of treated and control prawns was collectedfrom the substernal hemolymph sinus at 4-day intervals. Each
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