🛡️ 三國動物園 。鯊魚科普 14

🛡️ 三國動物園 | Three Kingdoms Zoo 🦈 鯊魚科普 | Shark Facts 第14篇 / Episode 14 鯊魚的生命與繁殖 / Shark Lifespan & Reproduction ⏳ 鯊魚壽命 / Lifespan 大部分鯊魚的壽命約 20–30 年，不過種類不同差異很大 Most sharks live 20–30 years, though lifespan varies by species. 有些鯊魚可以活得更久，如格陵蘭鯊可超過 400 年 Some species, like the Greenland shark, can live over 400 years. --- 🐣 繁殖方式 / Reproduction 鯊魚的繁殖方式多樣，主要分三類： 1. 卵生 / Oviparous 母鯊產下卵，卵包在硬殼中，外界孵化 例子：豹紋鯊、犬鯊 Egg-laying sharks lay eggs encased in protective shells, which hatch externally. 2. 卵胎生 / Ovoviviparous 卵在母體內孵化，寶寶在體內吸收卵黃，出生時已是小鯊魚 例子：灰鯊 Eggs develop inside the mother; pups hatch internally and are born live. 3. 胎生 / Viviparous 母體內透過胎盤直接供養寶寶，出生時已經活著 例子：某些鯊魚如牛頭鯊 Embryos develop with direct nourishment from the mother via a placenta. --- 🤰 懷孕期 / Gestation Period 鯊魚懷孕時間長短差異大 一般約 9–12 個月 Gestation usually lasts 9–12 months, depending on species. 有些種類如大白鯊，可達 18 個月 Some species, like the great white shark, can gestate up to 18 months. 出生的寶寶數量也不同，有些一次只生幾隻，有些一次可生 20–30 隻 Litter sizes vary: some give birth to a few pups, others up to 20–30. --- 💡 冷知識 / Fun Facts 鯊魚的生長速度慢，幼鯊成長到成年可能需 5–15 年 Sharks grow slowly; juveniles may take 5–15 years to reach adulthood. 母鯊在懷孕期間仍然活躍，捕食、游動不受影響 Pregnant females remain active, hunting and swimming normally. 新生鯊魚一出世就能自主覓食，不依賴母體 Pups are independent at birth and must hunt for themselves.