def __get_mortality_pp_increase(self, temperature: float, fish_mass: float) -> float:
    'Get the mortality percentage point difference increase.\n\n        :param temperature: the temperature in Celsius\n        :param fish_mass: the fish mass (in grams)\n        :returns: Mortality percentage point difference increase\n        '
    fish_mass_indicator = (1 if (fish_mass > 2000) else 0)
    input = np.array([1, temperature, fish_mass_indicator, (temperature ** 2), (temperature * fish_mass_indicator), (fish_mass_indicator ** 2)])
    return max(float(self.quadratic_fish_mortality_coeffs.dot(input)), 0)
Get the mortality percentage point difference increase.

:param temperature: the temperature in Celsius
:param fish_mass: the fish mass (in grams)
:returns: Mortality percentage point difference increase
def __get_mortality_pp_increase(self, temperature: float, fish_mass: float) -> float:
    'Get the mortality percentage point difference increase.\n\n        :param temperature: the temperature in Celsius\n        :param fish_mass: the fish mass (in grams)\n        :returns: Mortality percentage point difference increase\n        '
    fish_mass_indicator = (1 if (fish_mass > 2000) else 0)
    input = np.array([1, temperature, fish_mass_indicator, (temperature ** 2), (temperature * fish_mass_indicator), (fish_mass_indicator ** 2)])
    return max(float(self.quadratic_fish_mortality_coeffs.dot(input)), 0)