.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "gallery/example_larvae.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_gallery_example_larvae.py>`
        to download the full example code

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_gallery_example_larvae.py:


Fish Eggs and Larvae
====================

.. GENERATED FROM PYTHON SOURCE LINES 6-13

.. code-block:: Python


    from datetime import datetime, timedelta
    from opendrift.readers.reader_constant import Reader as ConstantReader
    from opendrift.models.larvalfish import LarvalFish

    o = LarvalFish(loglevel=50)








.. GENERATED FROM PYTHON SOURCE LINES 14-15

No horizontal movement, here only investigating vertical mixing and swimming

.. GENERATED FROM PYTHON SOURCE LINES 15-22

.. code-block:: Python

    r = ConstantReader(
            {'x_sea_water_velocity': 0, 'y_sea_water_velocity': 0, 'x_wind': 0, 'y_wind': 0,
             'sea_water_temperature': 10,
             'land_binary_mask': 0, 'ocean_vertical_diffusivity': .02})
    o.add_reader(r)
    o.set_config('general:use_auto_landmask', False)








.. GENERATED FROM PYTHON SOURCE LINES 23-24

Seeding 20 fish eggs, which will hatch as larvae after some time, depending om temperature

.. GENERATED FROM PYTHON SOURCE LINES 24-29

.. code-block:: Python

    time = datetime(2020, 7, 1, 12)
    o.seed_elements(lon=4, lat=60, time=[time, time+timedelta(hours=24)], number=20)

    o.run(duration=timedelta(days=40))








.. GENERATED FROM PYTHON SOURCE LINES 30-31

After 20 days eggs are hatched as Larvae, and starting to grow

.. GENERATED FROM PYTHON SOURCE LINES 31-34

.. code-block:: Python

    o.plot_property('weight')
    o.plot_property('length')




.. rst-class:: sphx-glr-horizontal


    *

      .. image-sg:: /gallery/images/sphx_glr_example_larvae_001.png
         :alt: weight
         :srcset: /gallery/images/sphx_glr_example_larvae_001.png
         :class: sphx-glr-multi-img

    *

      .. image-sg:: /gallery/images/sphx_glr_example_larvae_002.png
         :alt: length
         :srcset: /gallery/images/sphx_glr_example_larvae_002.png
         :class: sphx-glr-multi-img





.. GENERATED FROM PYTHON SOURCE LINES 35-37

We see that larvae (after hatching) avoid the upper meters at daytime, to avoid predators.
Vertical motion is a combination of vertical mixing, buoyancy and swimming.

.. GENERATED FROM PYTHON SOURCE LINES 37-39

.. code-block:: Python

    o.plot_property('z')




.. image-sg:: /gallery/images/sphx_glr_example_larvae_003.png
   :alt: z
   :srcset: /gallery/images/sphx_glr_example_larvae_003.png
   :class: sphx-glr-single-img





.. GENERATED FROM PYTHON SOURCE LINES 40-41

Mean daily depth shows more clearly the diurnal migration of larvae

.. GENERATED FROM PYTHON SOURCE LINES 41-42

.. code-block:: Python

    o.plot_property('z', mean=True)



.. image-sg:: /gallery/images/sphx_glr_example_larvae_004.png
   :alt: z
   :srcset: /gallery/images/sphx_glr_example_larvae_004.png
   :class: sphx-glr-single-img






.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 27.745 seconds)


.. _sphx_glr_download_gallery_example_larvae.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: example_larvae.ipynb <example_larvae.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: example_larvae.py <example_larvae.py>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_