Thursday, 3 January 2013
Tuesday, 1 January 2013
BUAH ARA - kegemaran ikan sungai
Biasanya buah ara tumbuh meliar di tebing sungai di kawasan kampung. Memancing ketika musim pokok ara berbuah adalah menyeronokkan kerana buahnya menjadi kegemaran pelbagai spesies ikan terutama di Sungai Perak dan Sungai Pahang.
Ikan kaloi (paling mudah didapati, lampam, tongsan sisik kasar, patin, lawang dan kekadang baung turut menggemari buah ara). Ketika buah ara masak ranum masa adalah terbaik untuk memancing.Ketika ini ikan mudah mabuk kerana memakan buah yang gugur dan masa yang sama pemancing boleh tumpang sekaki dengan meletak buah yang dicangkuk pada mata kail
Selain itu. anda boleh membelah atau memotong buah ara yang masak ranum untuk mengeluarkan aromanya supaya senang dicangkuk satu persatu sampai panjang lebih kurang sejengkal pada perambut.Teknik ini sangat sesuai digunakan di lubuk yang agak jauh dari pokok ara yang kebiasaannya banyak terdapat di tebing sungai sekitar daerah Perak Tengah.
Musim buah ara masak antara empat dan lima kali setahun. Setiap kali masak boleh tahan seminggu namun begitu tidak semua buah pokok ara menjadi kegilaan ikan sungai. Biasanya yang berbau wangi dan warna merah hati menjadi pilihan pemancing sekitar daerah Perak.
sumber drp Akhbar Joran, Berita Harian
More Stories: http://gofishtalk.com/forum/topics/buah-ara-kegemaran-ikan-sungai-1Black Piranha And Megapirahna Hold Record For Most Powerful Bite
December 21, 2012
Image Credit: Peter Jochems / Shutterstock
Brett Smith for redOrbit.com – Your Universe Online
In an attempt to calculate the bite force of the extinct Megapiranha, an international team of marine biologists have said the modern-day black piranha, along with its extinct counterpart, have the most powerful bite of any apex predator, for its body size.
According to a new study in the journal Scientific Reports, researchers have recorded the first bite-force measurements taken from wild specimens of the largest species of carnivorous piranha, the black piranha.
In the study, the team of scientists collected 15 black piranha specimens from Xingu and Iriri tributaries of the Amazon River in Brazil using nets and fishing techniques. To minimize their impact on the fish and maintain their integrity, the scientists used barbless hooks and conducted bite-pressure tests immediately after the fish were caught.
According to the report, the fish “readily performed multiple defensive bites with the transducer placed between the tips of the jaws.”
Some fish were dissected in the field to examine and record the morphology of their jaws.
These observations allowed the scientists to describe the underlying physiology of the jaws that gives this creature the ability to bite with a force of over 30 times greater than its body weight. The large, yet short, muscle mass in the black piranha’s jaw and highly specialized jaw-closing lever allows the fish to chomp down with remarkable force.
Based on the data collected from the black piranha, the researchers made conservative estimates about the bite force of the much larger, but extinct, Megapiranha. Without definitive fossil evidence, the team had to assume the extinct piranha and the black piranha, a close evolutionary relative, shared a similar jaw physiology.
They determined the extinct fish bit down with a force four times greater than the largest black piranha. They also found the Megapiranha would have been able to bite into a bovine femur with no problem. Turtles and armored catfish, two of the Megapiranhas contemporaries, would have stood little chance against the crushing bite.
Inspired by their calculations, the authors of the report wondered—what exactly were these fish eating that required such a strong biting force?
“Did Megapiranha use their strong jaws and novel dentition to not only slice into their prey’s compliant flesh, but also crush through their stiff bones? Our bite simulations indicate Megapiranha’s hybrid teeth were indeed capable of transmitting sufficient bite pressure to generate micro-fractures in robust cortical mammalian bone as well as complete mechanical failure of thinner vertebrate bony tissues,” the authors wrote in their report.
Based on the known tooth morphology of Megapiranhas, the scientists posited the big fish did indeed hunt turtles and bony fish.
The fieldwork portion of the study was organized and filmed by National Geographic. Some of the footage shot in the field was used in a program called Megapiranha, which aired on the National Geographic Channel.
“It was very exciting to participate in this project, travel one more time to the Amazon to be able to directly measure bite forces in the wild,” Guillermo Ortí, a George Washington University Professor of Biology, said in a statement. “I learned a lot of biomechanics from my colleagues while collecting valuable specimens for my own research.”
In an attempt to calculate the bite force of the extinct Megapiranha, an international team of marine biologists have said the modern-day black piranha, along with its extinct counterpart, have the most powerful bite of any apex predator, for its body size.
According to a new study in the journal Scientific Reports, researchers have recorded the first bite-force measurements taken from wild specimens of the largest species of carnivorous piranha, the black piranha.
In the study, the team of scientists collected 15 black piranha specimens from Xingu and Iriri tributaries of the Amazon River in Brazil using nets and fishing techniques. To minimize their impact on the fish and maintain their integrity, the scientists used barbless hooks and conducted bite-pressure tests immediately after the fish were caught.
According to the report, the fish “readily performed multiple defensive bites with the transducer placed between the tips of the jaws.”
Some fish were dissected in the field to examine and record the morphology of their jaws.
These observations allowed the scientists to describe the underlying physiology of the jaws that gives this creature the ability to bite with a force of over 30 times greater than its body weight. The large, yet short, muscle mass in the black piranha’s jaw and highly specialized jaw-closing lever allows the fish to chomp down with remarkable force.
Based on the data collected from the black piranha, the researchers made conservative estimates about the bite force of the much larger, but extinct, Megapiranha. Without definitive fossil evidence, the team had to assume the extinct piranha and the black piranha, a close evolutionary relative, shared a similar jaw physiology.
They determined the extinct fish bit down with a force four times greater than the largest black piranha. They also found the Megapiranha would have been able to bite into a bovine femur with no problem. Turtles and armored catfish, two of the Megapiranhas contemporaries, would have stood little chance against the crushing bite.
Inspired by their calculations, the authors of the report wondered—what exactly were these fish eating that required such a strong biting force?
“Did Megapiranha use their strong jaws and novel dentition to not only slice into their prey’s compliant flesh, but also crush through their stiff bones? Our bite simulations indicate Megapiranha’s hybrid teeth were indeed capable of transmitting sufficient bite pressure to generate micro-fractures in robust cortical mammalian bone as well as complete mechanical failure of thinner vertebrate bony tissues,” the authors wrote in their report.
Based on the known tooth morphology of Megapiranhas, the scientists posited the big fish did indeed hunt turtles and bony fish.
The fieldwork portion of the study was organized and filmed by National Geographic. Some of the footage shot in the field was used in a program called Megapiranha, which aired on the National Geographic Channel.
“It was very exciting to participate in this project, travel one more time to the Amazon to be able to directly measure bite forces in the wild,” Guillermo Ortí, a George Washington University Professor of Biology, said in a statement. “I learned a lot of biomechanics from my colleagues while collecting valuable specimens for my own research.”
Source: Brett Smith for redOrbit.com – Your Universe Online
More News: http://gofishtalk.com/forum/topics/black-piranha-and-megapirahna-hold-record-for-most-powerful-bite
News: www.Gofishtalk.com
More News: http://gofishtalk.com/forum/topics/black-piranha-and-megapirahna-hold-record-for-most-powerful-bite
News: www.Gofishtalk.com
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