Lethal temperature and salinity
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In Ichthyop, there is the possibility to define a range of temperature and salinity beyond which the particle is killed. 

Lethal temperature
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The functionning og the lethal temperature module depends on whether the growth module is enabled or not.

Growth disabled
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lethal temperature can either be provided in a CSV file (``lethal_temp_file`` parameter), which provides the lower and upper temperature values that can be supported by the particle as a function of age (in hours). The file must have the following format:

.. code:: bash

    Time(hour);Cold temperature (C);Warm temperature (C)
    0;14;22
    48;13;22
    96;12;22

In this case, three age classes will be considered: :math:`[0, 48[`, :math:`[48, 96[` and :math:`[96, \infty[`

If the ``lethal_temp_file`` parameter is not defined, single values will be used independently of the age. These values are provided in the ``cold_lethal_salinity_egg`` and ``warm_lethal_salinity_egg`` parameters. 

Note that the ``temperature_field`` parameter, providing the name of the temperature variable, must also be provided.

.. index:: lethal_temp_file, temperature_field, lethal_temp_file, cold_lethal_salinity_egg, warm_lethal_salinity_egg

Growth enabled
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If the growth module is enabled, two cold and warm lethal temperatures must be provided. One for eggs (``cold_lethal_temperature_egg`` and ``hot_lethal_temperature_egg``), one for larva (``cold_lethal_temperature_larva`` and ``hot_lethal_temperature_larva``).

The stage (``egg`` or ``larva``) is determined by the growth module, and the right temperature range is applied to the particle.

.. index::  cold_lethal_temperature_egg, hot_lethal_temperature_egg, cold_lethal_temperature_larva, hot_lethal_temperature_larva

Lethal salinity
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Lethal salinity can either be provided in a CSV file (``lethal_salt_file`` parameter), which provides the lower and upper salinity values that can be supported by the particle as a function of age (in hours). The file must have the following format:

.. code:: bash

    Time(hour);Fresh salinity (PSU);Salty salinity (PSU)
    0;35;40
    48;30;40
    96;30;45

In this case, three age classes will be considered: :math:`[0, 48[`, :math:`[48, 96[` and :math:`[96, \infty[`

If the ``lethal_salt_file`` parameter is not defined, single values will be used independently of the age. These values are provided in the ``fresh_lethal_salinity_egg`` and ``saline_lethal_salinity_egg`` parameters. 

Note that the ``salinity_field_`` parameter, providing the name of the salinity variable, must also be provided.

.. index:: lethal_salt_file, salinity_field, fresh_lethal_salinity_egg, saline_lethal_salinity_egg