If they swim too slowly, they stall and sink just like an aircraft, and this in spite of a buoyancy  inducing cache of oil stored in a liver so big that it may account for one quarter of the sharks total weight
शार्कच्या अनेक जातींना पोहताना तोंडावाटे व कल्ल्यांतून ऑक्सीजनयुक्‍त पाण्याचा पुरवठा होतो.