Bisakah Ikan melihat dengan baik di dalam air? Mengapa ikan tidak tenggelam?/ Can fish see well in the water? Why fish do not drown? FOR GENERAL GEOGRAPHY
Bisakah Ikan melihat dengan baik di dalam air? Mengapa ikan tidak tenggelam?
(sumber: Rosda Group.1994. Ensiklopedi Laut dan Samudera. Jakarta: PT Rosda Jayaputra.)
A) Bisakah ikan melihat dengan baik di dalam air?
Ikan mempunyai mata yang besar dan agak mencolok. Akan tetapi, mereka tidak bisa melihat dengan baik. Biasanya, air laut sangat keruh. Meskipun demikian, ikan bisa mengetahui apa yang terjadi disekeliling mereka. Ikan menggunakan baud an rasa air sebagai Patokan. Mereka juga bisa mendengar bunyi yang tidak terdengar oleh kita. Selain itu, ikan juga merasakan setiap gerakan air. Ikan mempunyai indera tersendiri di sekujur tubuhnya. Bisa dikatakan bahwa binatang ini dilengkapi dengan mata, telinga, dan indera perasa yang peka. Semua itu membuat mereka bisa hidup di air dengan baik.
B) Mengapa Ikan tidak tenggelam?
Meskipun kadang-kadang diam saja di air, ikan tidak akan tenggelam karena ikan mempunyai kantung udara dalam badannya. Hanya hiu yang tidak mempunyai kantung seperti itu. Oleh karena itu, hiu harus terus bergerak di dalam air. Sirip yang terdapat pada ikan tidak berfungsi sebagai kemudi, seperti yang kita kira. Dengan sirip itu ikan bisa tetap tegak, bergerak cepat, dan tidak tenggelam. Untuk berenang ikan menggunakan sirip ekor. Makin cepat sirip itu digerakkan, makin cepatlah ikan itu meluncur. Sisik tebal yang bertumpuk membuat ikan makin mudah meluncur di air.
IN ENGLISH (with google translate Indonesian-english):
Can fish see well in the water? Why fish do not drown?
(source: Rosda Group.1994. Encyclopedia of Marine and Ocean.Jakarta: PT Rosda Jayaputra.)
A) Can fish see well in the water?
The fish has large eyes and a rather striking. However, they can notsee well. Typically, the sea water is very murky. Nevertheless, the fish can find out what's going on around them. The fish use water as a baud's taste benchmark. They could also hear the sounds that are not audible to us. In addition, fish also feel every movement of the water. The fish has a sense of its own in his body. It could be saidthat this beast comes with eyes, ears and sense of touch sensitive.All that enable them to live in the water well.
B) Why fish do not drown?
Although sometimes silent in the water, the fish will not sinkbecause the fish have air sacs in the body. Only sharks that do not have such a bag. Therefore, the sharks have to keep moving in the water. There are fish fin function as the steering wheel, as wesuppose. With fins that the fish could stay upright, move quickly, anddid not drown. For fish swim using a tail fin. Fins is driven faster, the faster the fish glide. Thick scales which overlap makes the fish more easily glide across the water.
(source: Rosda Group.1994. Encyclopedia of Marine and Ocean.Jakarta: PT Rosda Jayaputra.)
A) Can fish see well in the water?
The fish has large eyes and a rather striking. However, they can notsee well. Typically, the sea water is very murky. Nevertheless, the fish can find out what's going on around them. The fish use water as a baud's taste benchmark. They could also hear the sounds that are not audible to us. In addition, fish also feel every movement of the water. The fish has a sense of its own in his body. It could be saidthat this beast comes with eyes, ears and sense of touch sensitive.All that enable them to live in the water well.
B) Why fish do not drown?
Although sometimes silent in the water, the fish will not sinkbecause the fish have air sacs in the body. Only sharks that do not have such a bag. Therefore, the sharks have to keep moving in the water. There are fish fin function as the steering wheel, as wesuppose. With fins that the fish could stay upright, move quickly, anddid not drown. For fish swim using a tail fin. Fins is driven faster, the faster the fish glide. Thick scales which overlap makes the fish more easily glide across the water.
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