bedrock-samples/resource_pack/particles/fish_pos.json

{
  "format_version": "1.10.0",
  "particle_effect": {
    "description": {
      "identifier": "minecraft:fish_pos_particle",
      "basic_render_parameters": {
        "material": "particles_alpha",
        "texture": "textures/particle/particles"
      }
    },
    "components": {
      "minecraft:emitter_rate_instant": {
        "num_particles": 1
      },        
      "minecraft:emitter_lifetime_once": {
      },
      "minecraft:emitter_shape_point": {
        "direction": [ "variable.direction.x * 0.2 + Math.random(-1, 1) * 0.02", "variable.direction.y * 0.2 + Math.random(-1, 1) * 0.02", "variable.direction.z * 0.2 + Math.random(-1, 1) * 0.02" ]
      },
      "minecraft:particle_lifetime_expression": {
        "max_lifetime": "2 / ((Math.Random(0.0, 1.0) * 0.8 + 0.2) * 5)"
      },
      "minecraft:particle_expire_if_not_in_blocks": [
        "minecraft:water",
        "minecraft:flowing_water",
        "minecraft:bubble_column"
      ],
      "minecraft:particle_motion_dynamic": {
        "linear_acceleration": [ 0, 0.8, 0 ],
        "linear_drag_coefficient": 5.25
      },
      "minecraft:particle_appearance_billboard": {
        "size": [ "(0.05*variable.particle_random_1+0.1)*(variable.particle_random_2*0.9+0.2)", "(0.05*variable.particle_random_1+0.1)*(variable.particle_random_2*0.9+0.2)" ],
        "facing_camera_mode": "lookat_xyz",
        "uv": {
          "texture_width": 128,
          "texture_height": 128,
          "uv": [ 0, 16 ],
          "uv_size": [ 8, 8 ]
        }
      },
      "minecraft:particle_appearance_lighting": {}
    }
  }
}