Marine Science Biology III: Salmon dissection experiment 【video of the experiments】

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  • Select activity This is a video of the student experiment “Marine Science Biology III”.

    

    This is a video of the student experiment “Marine Science Biology III”. 포럼
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    Japanese URL
• Select section Overview of the experiment

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  Overview of the experiment

  • Select activity This is a dissection experiment on immature ocean...

    This is a dissection experiment on immature oceanic pink salmon.

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

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  • Select activity Scales

    

    Scales 웹페이지
• Select section Abdominal dissection

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  Abdominal dissection

  • Select activity This is a dissection experiment on immature ocean...

    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.

    
    

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  • Select activity HSI (Hepato Somatic Index) refers to “the percent...

    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

    
    

  • Select activity GSI (Gonado Somatic Index) refers to “the ratio o...

    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

    
    

• Select section Head dissection

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  Head dissection

  • Select activity This is a dissection experiment on immature ocean...

    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.

    
    

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  • Select activity 脳:brain 嗅神経系:olfactory nervous system 吻側:rostr...

    
    

    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

    
    

  • Select activity Olfactory chamber

    

    Olfactory chamber 웹페이지
  • Select activity Otolith

    

    Otolith 웹페이지
• Select section Dorsal ridge

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  Dorsal ridge

  • Select activity Describes the dorsal ridge of a male mature pink ...

    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.

    
    
    

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• Select section 【Related courses】

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  【Related courses】