• Recording Duration: If the camera is only used occasionally for shooting, a small-capacity memory card, such as 32GB or 64GB, may be sufficient. However, if long-term continuous recording is required—for example, several hours of underwater aquaculture monitoring every day—it is recommended to choose a memory card with a capacity of 128GB or higher.
• Video Resolution and Frame Rate: The higher the resolution and frame rate, the larger the video data size, and the greater the required storage capacity. For instance, a 2-megapixel camera (1920×1080 resolution) using H.264 encoding with a bitrate of 4M will require approximately 42.19GB of storage for one day of video (calculation: 4M × 3600 × 24 ÷ 8 ÷ 1024 ≈ 42.19G). For 4K resolution, the bitrate may reach 8M or higher, and the storage capacity needed for one day of video will be approximately 84.38GB.
• Encoding Format: Different encoding formats have different compression efficiencies and occupy different storage spaces. H.264 is a widely used encoding format, while H.265 is its next-generation standard. Compared to H.264, H.265 can reduce the bitrate by 50% at the same video quality. For example, a 2-megapixel camera with H.265 encoding (2M bitrate) will require approximately 21.1GB of storage for one day of video.
• Maximum Capacity Supported by the Device: Before purchasing a memory card, be sure to check the camera's manual to find out the maximum capacity supported by the device. Some cameras may have restrictions on memory card capacity; if the capacity exceeds the maximum supported by the device, the memory card may not work properly.

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