Danny 發問時間: 社會與文化語言 · 1 0 年前

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· Reproduction

The megamouths II and VI were both mature males, and both showed evidence of recent mating. The claspers of megamouth II were oozing spermatophores and those of the sixth specimen were abraded and bleeding, a common occurrence in sharks that have just mated. The 6th megamouth also had a fresh wound on the lower jaw, a feature found in other sharks that grasp one another\'s mouth during mating. Megamouth II was taken in late November and megamouth VI in late October, these factors make scientists believe that Southern California might be a mating area for megamouth sharks in the fall.

The claspers of the first captured megamouth were fully described. Its claspers were relatively slender, with tip elongated, forming a very narrow, slender process.

The 7th megamouth observed, a female with 471cm in total length was heavily studied and one of the conclusions is that this specimen is immature. This judgement was based on uteri that were enlarged only posteriorly, a poorly developed ovary and ostium and the small size of the oocytes. The ovary of the megamouth is similar to other mackerel sharks and this suggests that megamouth embryos are oophagous (the first well-developed embryo eats the other eggs in the uterus). The 12th megamouth captured is the only known mature female. The total length of this specimen was 5.44m and the expanded uteri measured 260mm. The right ovary possessed a large number of whitish yellow eggs.

· Predators

The only confirmed register of a megamouth predator is an isolated event of sperm whales (Physeter macrocephalus) attacking this shark. This occurred in Manado, North Sulawesi, Indonesia (30th August 1998) near midday, while some researchers were observing the whales. The base of the dorsal fin and the gills of the shark showed signs of the whales\' attack.

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  • 大頭
    Lv 6
    1 0 年前
    最佳解答

     · 生殖  2號和6號巨口鯊兩隻都是成熟雄性,而且兩者都顯現最近有交配的跡象。在2號巨口鯊的鰭腳處分泌出精囊,而且第六組樣本有被擦傷流血現象,這在剛交配的鯊魚身上是常發生的。第 6 號巨口鯊在顎下也有新的傷口,這種在交配時互抓對方嘴巴的特徵,其他鯊類也曾被發現。以十一月底的2號巨口鯊及十月底的6號巨口鯊為例,這讓科學家們相信,入秋的南加州可能是巨口鯊的交配區域。 第一隻被捕獲巨口鯊的鰭腳有完整的描述。牠的鰭腳相當細,其尖端延長,形成非常狹細的突起。 觀察第 7 號巨口鯊,一隻全長471公分的雌鯊,已被相當程度地研究,且其中一個結論就是,這隻樣本尚未成熟。這個判斷基於:只有在後側長大的子宮、尚未發育的卵巢和子宮口,以及小小的卵母細胞。 巨口鯊的卵巢 與其他鯖鯊相似,而且這促成巨口鯊胚胎為食卵性(oophagous 先長成的胚胎會吃子宮裡其他的卵)的。被補獲的第 12 巨口鯊是唯一已知的成熟雌鯊。全長5.44公尺的樣本有超大的子宮,量起來有260公釐。右邊卵巢有大量的淡黃色卵子。  · 掠食者  巨口鯊掠食者的唯一確切的記錄,是一件被抹香鯨(sperm whale 或 Physeter macrocephalus) 群攻擊的單獨事件。此事件發生在印尼Sulawesi北邊的Manado(1998年8月30日),近午時分,一些研究員正在觀察鯨魚的時候。背鰭的基部和魚鰓都有被鯨魚的攻擊的痕跡。  

  • 1 0 年前

    P 再生 II 和VI那些megamouths兩成熟雄性,並且兩近來證據顯示鋪席子。 滲出spermatophores的II的那些claspers的megamouth的和那些的第6 樣品的被磨損並且出血,普通事件在剛剛交配的鯊魚。 第6 megamouth也下顎一個新的傷口,一個特徵在其他鯊魚裡發現下鋪席子期間抓住彼此的嘴。 Megamouth II在10月下旬晚11月和megamouth VI被接受, 這些原素使科學家相信南加利福尼亞在秋季可能是megamouth鯊魚的一個鋪席子的地區。 第一個捕獲的megamouth的claspers被完全描述。 它的claspers 相對細長,訊息拉長,形成一個非常狹窄,細長的過程。 觀察的那些第7 megamouth,一女性與一起總長度471厘米被重研究和那些結論之一是這幾次樣品未發育完全。 這種判斷基于只被擴大的子宮posteriorly,不好發展的卵巢和ostium 和oocytes的小號。 megamouth的卵巢類似于其他鯖魚鯊魚,這表明megamouth 胚是oophagous (第一個發展得好的胎兒在子宮裡吃其它蛋)。 捕獲的第12 megamouth是唯一的認識的成熟的女性。 這件樣品的總長度是5.44米,被擴大的子宮測量260毫米右卵巢擁有許多帶白色黃的蛋。 P食肉動物 megamouth食肉動物的唯一的證實登記是攻擊這只鯊魚的精液鯨魚(Physeter macrocephalus)的一次獨立的事件。 這在Manado,北部Sulawesi,在正午附近的印尼(1998年8月30日)內發生,而一些研究人員觀察鯨魚。 背鰭的底部和鯊魚的鰓有鯨魚的攻擊的跡象。

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