اطلس ماهیان آب های شیرین و شور

دوتا  فایل پی دی اف فوق العاده عالی درباره ماهی شناسی عمومی و سیستماتیک که توی هر کدوم آناتومی ماهی ها رو اول گفته و بعد تک به تک ماهی ها رو معرفی کرده . عالیه حتما دانلود کنید…

دوستانی که میخوان کنکور کارشناسی ارشد بدن خیلی این فایل ها میتونه بهشون کمک کنه : چون هم ماهی شناسی عمومی و سیستماتیک شون قوی میشه هم زبان تخصصی …

لینک های جدید قرار داده خواهد شد…

 ۱ – ماهیان آب شور  :

۲ –  ماهیان آب شیرین :

گوشه ای از مطلب:

A fish’s skeleton is composed of cartilage or bone. Basically, the skeleton provides
a foundation for the body and the fins, encases and protects the brain
and the spinal cord, and serves as an attachment for muscles.

The fish’s heart is located close behind the fish’s mouth. Blood vessels are
largest close to the heart and become progressively smaller, terminating in a
network of extremely fine capillaries that meander through the body tissues.
The blood of a fish, like blood in all vertebrates, is composed of plasma (fluid) and blood cells (solid).

Reproduction and associated activities in fish are generally referred to as
spawning. The spawning season, or breeding period, is that time when the
eggs of the female and the milt, or sperm, of the male are ripe. This period
may last only a few days or it may extend into weeks and even months. Fish
that live in tropical waters of fairly constant temperature may spawn yearround.

This small and spunky member of the Carangidae family is
an occasional catch by anglers. Its flesh is considered fair to
good eating.

Size. The average frigate mackerel weighs less than 2
pounds and is less than 20 inches long. The all-tackle world
record is a 3-pound, 12-ounce fish.

Food. Palometa feed on crustaceans, marine worms, mollusks,
and small fish.