In the internal shock model of gamma ray bursts ultrahigh energy pions, kaons and neutrons are likely to be produced in the interactions of shock accelerated relativistic protons with low energy photons (KeV-MeV). The ultrahigh energy mesons and neutrons subsequently decay to high energy neutrinos/antineutrinos and other secondary particles. In the high internal magnetic fields of gamma ray bursts, the ultrahigh energy charged particles (φ+, K+ and μ+) lose energy significantly due to synchrotron radiations before decaying into secondary high energy neutrinos. However, the relativistic neutrons remain unaffected and decay to high energy antineutrinos, protons and electrons. We have calculated the total neutrino flux (neutrino and antineutrino) considering the decay channels of pions, muons, kaons and neutrons. We show that depending on the values of the parameters of a gamma ray burst the antineutrino flux generated in neutron decay can exceed the total neutrino flux produced from φ+ decay. Moreover, the charged kaons being heavier than pions, lose energy slowly and their secondary neutrino flux is more than that from pions at very high energy. We also discuss that the neutron decay and kaon decay antineutrino/neutrino fluxes may show distinct peaks in the total neutrino spectrum at different energies depending on the values of the parameters (luminosity, Lorentz factor, variability time) of a gamma ray burst.