{
  "cells": [
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "\n# Fish Eggs and Larvae\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "from datetime import datetime, timedelta\nfrom opendrift.readers.reader_constant import Reader as ConstantReader\nfrom opendrift.models.larvalfish import LarvalFish\n\no = LarvalFish(loglevel=50)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "No horizontal movement, here only investigating vertical mixing and swimming\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "r = ConstantReader(\n        {'x_sea_water_velocity': 0, 'y_sea_water_velocity': 0, 'x_wind': 0, 'y_wind': 0,\n         'sea_water_temperature': 10,\n         'land_binary_mask': 0, 'ocean_vertical_diffusivity': .02})\no.add_reader(r)\no.set_config('general:use_auto_landmask', False)"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Seeding 20 fish eggs, which will hatch as larvae after some time, depending om temperature\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "time = datetime(2020, 7, 1, 12)\no.seed_elements(lon=4, lat=60, time=[time, time+timedelta(hours=24)], number=20)\n\no.run(duration=timedelta(days=40))"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "After 20 days eggs are hatched as Larvae, and starting to grow\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "o.plot_property('weight')\no.plot_property('length')"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "We see that larvae (after hatching) avoid the upper meters at daytime, to avoid predators.\nVertical motion is a combination of vertical mixing, buoyancy and swimming.\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "o.plot_property('z')"
      ]
    },
    {
      "cell_type": "markdown",
      "metadata": {},
      "source": [
        "Mean daily depth shows more clearly the diurnal migration of larvae\n\n"
      ]
    },
    {
      "cell_type": "code",
      "execution_count": null,
      "metadata": {
        "collapsed": false
      },
      "outputs": [],
      "source": [
        "o.plot_property('z', mean=True)"
      ]
    }
  ],
  "metadata": {
    "kernelspec": {
      "display_name": "Python 3",
      "language": "python",
      "name": "python3"
    },
    "language_info": {
      "codemirror_mode": {
        "name": "ipython",
        "version": 3
      },
      "file_extension": ".py",
      "mimetype": "text/x-python",
      "name": "python",
      "nbconvert_exporter": "python",
      "pygments_lexer": "ipython3",
      "version": "3.11.6"
    }
  },
  "nbformat": 4,
  "nbformat_minor": 0
}