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  • Overview of the experiment

    • This is a dissection experiment on immature oceanic pink salmon.

      An overview of the experiment, fish measurements, and scales will be described.

    • 圖示 頁面
      Scales 頁面

  • Abdominal dissection

    • This is a dissection experiment on immature oceanic pink salmon.

      It will be explained in detail that the measurement of liver and gonad weights, counting of the pyloric caeca, and observation of gastric contents to confirm nutrition and maturity status with an abdominal dissection.


    • HSI (Hepato Somatic Index) refers to “the percentage of liver per body weight of an individual”.

      It generally increases before the spawning season. It is also sometimes used as an indicator of maturity, since it is known in some fish species that HSI decreases as GSI increases, as the liver sends accumulated nutrients to the gonads.

      HSI = (liver weight [g] / body weight [g]) *100


    • GSI (Gonado Somatic Index) refers to “the ratio of gonads per body weight of an individual”.

      It is often used to estimate the reproductive cycle of fish and as an indicator of maturity, and some fish species have been associated with HSI.

      GSI = (gonads weight [g] / body weight [g]) *100


  • Head dissection

    • This is a dissection experiment on immature oceanic pink salmon.

       A head dissection is performed to closely observe the brain, otoliths, gills, and olfactory chamber.



    • 脳:brain 嗅神経系:olfactory nervous system

      吻側:rostral side

      嗅房:olfactory chamber 嗅神経: olfactory nerve 嗅球: olfactory bulb

      終脳: telencephalon 視蓋:optic tecta 視床:thalamus 脳下垂体: pituitary gland 小脳:cerebellum 延髄: medulla oblongata 耳石（扁平石）: otolith (saccular otolith)

      尾側:caudal side


    • 圖示 頁面
      Olfactory chamber 頁面
    • 圖示 頁面
      Otolith 頁面

  • Dorsal ridge

    • Describes the dorsal ridge of a male mature pink salmon.

      You can observe their rarely seen cross sections and contents, as well as the ecological functions, advantages and disadvantages of dorsal ridges.



  • 【Related courses】

     Laboratorywork Fieldwork Salmon and Trout