Yellow Perch: Why are the mouth and opercula needed for a perh to repsire?
371357
its not only inportant for a yellow perch but also for almost any other fish. \nWater goes in through the mouth, out at the operculum. On its way it encounters the gills where oxygen absorbed in the water in taken up. \nLook at the animation in the link below to get some understanding of fish breathing
1128915
First go to your local sporting goods store, and get yourself some 4 inch and some 6 inch YUM dinger "worms".  And some YUM 7 inch ribbontail worms.  Also get a pack or 2 of Gamakatsu #2 worm hooks.  Rig both of these worms Texas style with out any wieght.  Cast near the edge of grass beds, where bass like to ambush thier prey from.  Also try flipping the worms near the shady side of underwater trees and rocks.  Keep your line taut by casting, and then raising your rod tip to get rid of the slack.  Do not reel in the line to pick up slack, because most hits will happen moments after the worm splashes into the water.  If it doesn't get an immediate strike, let the bait sink to the bottom, and then give the worm a few little tugs, as to jump the worm up about a foot off the bottom, then let it sink back to the bottom, then as it sinks again, keep your line taut, and do 1 or 2 cranks om the reel to pick up a little slack.  99% of hits will happen as the worms are falling down/ or sinking, so keeping the line taut will help you feel the hits. Bass usually don't eat worms off of the bottom.  You must also keep an eye on your line, because sometimes you won't feell the hit and your line may go to one side or the other and you'll know a bass has your bait.  When you hook a bass, be sure to reel him away from the cover, because that is right where the bass will go, and you have to be quick, or you will lose him.  After you get the bass away from the cover, let the fish wear itself out.  Then reel him in and carefully lip the bass.  DO NOT touch any part of the bass except the lip, unless you plan to eat them.  Fish have a protective enzyme that protects them from bacteria.  The slime is eaten away and removed, when you touch the bass, because of the amino acids on your skin.  Touching the bass removes this protective layer and opens the bass to bacterial and fungal infections which will kill the fish. Last night, I fished a heavily pressured lake and caught 9 bass in 3 hours. 8 largemouth and 1 smallmouth all with the YUM dinger.  On memorial day I fished a small farm pond and using the YUM ribbontail, I caught 16 largemouth in 4 hours.  It is all about presentation, so go to the site that the others have listed, the best is bass resource, which I put a link up for, and research how to best fish these worms.  I gave you my favorite and most productive methods.  Have fun and remember, tight lines.
421194
In general, sperm cells have to swim to find the eggs. So producing more of them increases the male's chance of fathering offspring. If Yellow Perch lay eggs in the water rather than have internal fertilization, then males might compete to have their sperm get to the eggs. This of course favors making as many sperm cells as possible.
97410
Yes. \nFishes only have internal ear, that is to say, no opening to the body surface and no tympanic membrane, but the vibrations (sound waves) are transmited from the water to the inner ear through the body tissues. Sound travels really well inside the water, even if we (with our land-adapted hearing system) cannot hear much of it. \nIn addition, some groups of freshwater fishes have a special system that enhances sound hearing. This is called "Webberian apparatus" and consists of a chain of small ossicles (derived from the first trunk vertebrae) that are situated between the swimming bladder and the internal ear. Thus, when sound waves contact the swimming bladder (which acts like the membrane of a drum), it is amplified and transmitted to the inner ear by means of the vibration of these small bones. The fishes that possess this system (known collectively as "ostariophysean" (Ostariophysi) include well-known species such as catfish, tetras and characins, carps, and the electric eel. \n\nBirds, as all tetrapods, _do_ have a middle ear, but with only one ossicle (we mammals have three). They don't have external ears, but they have a short external auditory meatus (duct) so the tympanic membrane is not on the surface (as in frogs). Sound makes the tympanum vibrate, this vibration is transmitted through the ossicle (columella auris) and goes to the inner ear.
98783
Salps are gelatinous, mostly transparent, and cylindrically shaped. They vary in size from a few millimetres at birth  up to about 10cm. One species is known to reach a few meters. Individual salps form a colony during the sexual phase of their lifecycle. The colony is long and chain-like in some species and  wheel-like in others.\nSalps filter food particles by pumping seawater in the mouth opening and out the atrial opening using muscle contractions. This pumping action gives animals propulsion, too so swimming and feeding occur at the same time.\nSalps have a complex lifecycle alternating between a sexual and asexual form. Sexual forms are called aggregates because they form a colony while asexual forms are solitary. All females have one or two eggs when released by a solitary parent. Mating occurs with larger male aggregates and embryos grow inside an aggregate body by being nurtured through a placenta. When embryos mature, they are released and the mother aggregate becomes male. Released embryos grow to be mature solitaries that asexually reproduce ‘stolons’ - buds of young aggregates.\nPretty wierd, huh? They look like jelly fish. And no, no backbones...!!
1074437
I found this article on parasites and fish.  Hope it helps.\n\nhttp://www.charkbait.com/article/RAPC2.htm
1052503
Carp here in MN are running Shallow today. I was just on the Mississippi and caught some NICE ones on crawlers about 10 yards from shore. Fish on the bottom always. Carp that are up high are not activly feeding\n\nLewis, they are the best fighter that the average joe can get from shore.
1062365
no, because fish have gills (breathe on the outside) unlike us we have lungs in the inside.  In my aquarium tank I have a small mouth Bass & Yellow Perch, when i feed my bass minnows he would have three minnows in it's mouth (minnows literally sticking out it's mouth)/ my perch as well.  They will swim around with half a minnow sticking out it's mouth and act like it's no big deal.  You will see this with bluegill they will take the worm and swim around with it hanging out it's mouth.  I just feed my fish (thanks for reminding me) and I took pictures so if you want to see them just e-mail and I'll send it to you.  \n-About the dead smaller fish stuck in it's throat some fish I catch may puke up fish due to exhaustion.  When i go fishing for walleyes and northern pike I've had them cough up fish on me.  I've had bass do the same.  \n-Death? He could have died due to foul hooking (not meaning snagging) but if it hook in the middle or back of the throat can kill any fish especially if it's kept out of the water to long, just cut the line and release.  It doesn't work out all the time.
541290
Carp can change its gill structure by having a lack of protruding lamellae (primary site for gas exchange) for survival in anoxic (without or limited oxigen) water. Therefore, they can breath air and forget about its oxigen consumption for around a month if they want.
934358
I couldn't possibly tell you about your fish.  However, I CAN tell you that your question is in the wrong section.  Try posting it in PETS>Fish...you might get a better response.  This section is for HUMAN illnesses and conditions!
450153
Don't worry about it; keep using the chisel - pretty soon, you'll be able to floss with the mooring line from your bass boat!\nYee-haw!
1187469
Try a Rapala "shad rap" in a perch pattern.  I have found it to be very productive for lake perch. A few years ago, I caught almost 30 perch in 3 hours using this lure.  Tight lines.
1173423
Digestive system\nThe advent of jaws allowed fish eat a much wider variety of food, including plants and other organisms. In fish, food is ingested through the mouth and then broken down in the esophagus. When it enters the stomach, the food is further broken down and, in many fish, further processed in fingerlike pouches called pyloric ceca. The pyloric ceca secrete digestive enzymes and absorb nutrients from the digested food. Organs such as the liver and pancreas add enzymes and various digestive chemicals as the food moves through the digestive tract. The intestine completes the process of digestion and nutrient absorption.\n\n[edit]\nRespiratory system\nMost fish exchange gases by using gills that are located on either side of the pharynx. Gills are made up of threadlike structures called filaments. Each filament contains a network of capillaries that allow a large surface area for the exchange of oxygen and carbon dioxide. Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gill filaments. The blood in the capilaries flows in the opposite direction to the water, causing counter current exchange. They then push the oxygen-poor water out through openings in the sides of the pharynx. Some fishes, like sharks and lampreys, possess multiple gill openings. However, most fishes have a single gill opening on each side of the body. This opening is hidden beneath a protective bony cover called an operculum. Some fishes, such as lungfish, have developed an adaptation that allows them to survive in oxygen-poor areas or places where bodies of water constantly dry up. These species of fish possess specialized organs that serve as lungs. A tube brings air containing oxygen to this organ by way of the fish's mouth. Some kinds of lungfish are so dependant on receiving oxygen from the air that they will suffocate if not allowed to reach the surface of the water.\n\n[edit]\nCirculatory system\nFishes have a closed circulatory system with a heart that pumps the blood in a single loop throughout the body. The blood goes from the heart to gills, from the gills to the rest of the body, and then back to the heart. In most fishes, the heart consists of four parts: the sinus venosus, the atrium, the ventricle, and the bulbus arteriosus. Despite consisting of four parts, the fish heart is still a two-chambered heart. The sinus venosus is a thin-walled sac that collect blood from the fish's veins before allowing it to flow to the atrium, which is a large muscular chamber. The atrium serves as a one-way compartment for blood to flow into the ventricle. The ventricle is a thick-walled, muscular chamber and it does the actual pumping for the heart. It pumps blood to a large tube called the bulbus arteriosus. At the front end, the bulbus arteriosus connects to a large blood vessel called the aorta, through which blood flows to the fish's gills.\n\n[edit]\nExcretory system\nAs with many aquatic animals, most fishes release their nitrogenous wastes as ammonia. Some of the wastes diffuse through the gills into the surrounding water. Others are removed by the kidneys, excretory organs that filter wastes from the blood. Kidneys help fishes control the amount of ammonia in their bodies. Saltwater fish tend to lose water because of osmosis. In saltwater fish, the kidneys concentrate wastes and return as much water as possible back to the body. The reverse happens in freshwater fish, they tend to gain water continuously. The kidneys of freshwater fish are specially adapted to pump out large amounts of dilute urine. Some fishes have specially adapted kidneys that change their function, allowing them to move from freshwater to saltwater.\n\n[edit]\nSensory and nervous system\nFishes have well-developed nervous systems that organize around a central brain, that is divided into different parts. The most anterior, or front, end of the brain are the olfactory bulbs, which are involved in the fish's sense of
692224
in order to fly fish properly and have fun casting you need: backing, fly line, leader connection, leader and tippet.\n\nBacking basically fills up your reel so the fly line rests perfectly, and also keeps the fly line from being tightly wound around the spool and developing memory. Your fly line is essential for casting. You need a leader because you cannot tie on a fly to a big fat fly line. you need a leader connector so you can remove the leader when it gets too short. Tippet is tied on at the end of your leader so you can use your leader for a long time and still replace flies.\n\nall fly line comes in weights, and you your line has got to match the weight of your rod. so if, for example you're putting this new reel on a 7'6" 4wt rod, you need 4wt (wt=weight) line. If you over or under weight your rod by more than 1wt, your rod will not cast the line nicely. An exact match is ideal. If your rod is a spit weight (ie 5/6wt) than either 5 or 6wt would work for you.\n\nAll fly lines come in tapers. The most common and easiest to cast, and most versatile is "weight forward", anything else if for casting specific types of flies or for special water needs.\n\nEach fly line is sold by code, so if your rod is a 4wt, you will be shopping for a line with the following code: WF 4WT (weight forward, 4 weight). Also, choose floating.\n\nfly line runs from $15 to $60 - you get what you pay for.\n\nBacking is typically dacron line, let the fly shop suggest it for you. Backing basically fills up the reel for you so your fly line fits perfectly on the reel. Backing is also used for battling big fish (big big fish).\n\nYou will need to connect your leader to your fly line. Have the fly shop put on a connector (sleeve or mono-tie in). The connector allows you to put a leader on your fly line without having to tie a knot. The connector will also allow you to replace the leader when it gets beat without having to undo knots or chop off part of your expensive fly line.\n\nyou can buy leaders for about $4 each. get knotless tapered ones, 7' 5 or 4x is good for trout.\n\nfinally, tippet is clear thin line that you tie to the end of your leader so you dont have to tie your fly to your leader. Every time you tie on a new fly, you end up wasting a piece of your line. Since leaders are tapered, there is only about 1' of material at the end that is fine enough to put through the eye of a fly hook. Tying on a piece of tippet gives you an extra diposable length of line to waste changing flies, and you always have line that will fit nicely in the hook eye. If you use tippet, you'll be able to keep your leader for several months. tippet comes in 30' spools, appx $4-8 per spool, and you should tie on appx 2' each time you tie on a length. \n\nThe weights of tippet come in X's, which if you read the tippet label, correspond to breaking strenght. the higher the # the lighter and more fragile the weight.\n\nso for example, if you buy a leader that is 7' 5x, that means the lightest section of the leader is equal to 5x tippet. You should buy 5x or 6x tippet to match. If you try to tie a really light tippet to a heavy leader (ie 3x leader, and 8x tippet) the diameter of the lines will be so different that your knot will have a hard time holding and you'll loose a fish.\n\nhope this helps. good luck.
908953
accuracey pure and simple.dentures 90% of the time need them as they pick up the soft tissues better. but rouitiene crown and bridge work will probably get away with a normal stock tray
628268
Very good answers by Calimecita (sorry though, the corect spelling is oxyrinchus; as you point out correctly it's named after the sharp nose, not the ancient city; it's a rather common mistake) and Haysoos.  Nonetheless, here a few other characteristics and a few thoughts about some of the characteristics mentioned.  The problem with cladistic analyses (i.e., reconstructing their phylogeny, or "family tree" if you like) of elasmobranchs (sharks, skates, and rays) is that they are often based on rather poor characteristics.  Even the great Leonard Compagno used characters such as body length, which is a rather variable, and therefore unreliable characteristic.  Now, the autapomorphies (characteristics of a particular taxon, or taxonomic group) listed by Calimecita are overall rather strong and reliable characteristics.  There are always two dorsal fins, with the second one being very much smaller than the first one.  So are the presence of the anal fin and the absence of the nictitating membranes (fancy word for eyelids in sharks), but the size and postion of the mouth is not quite as good a characteristic.  The most reliable apomorphies are actually embryonic characteristics, since they seem to have the least variability.  Here, the way embryos receive nutrients during gestation is actually a very helpful trait.  (Mind you, this is nothing you can see when you see either species in the wild...)\n\nBoth Carcharodon carcharias and Isurus oxyrinchus are oophagous, which means that throughout large parts of the gestation period the mother will continue to ovulate and shuttle eggs down the isthmus of her uterus into each of the uterine horns.  There the already developing embryos eat the eggs.  At one point the embryo's stomach is so far extended it looks as if the animal has swallowed a football.\nIn one lamniform species embryophagy has been demonstrated.  In the sand tiger shark (Carcharias taurus), the first embryo to hatch in each uterine horne will eat its siblings before entering the oophagous phase, in which it will eat the eggs ovulated by its mother.  \n\nFurthermore, embryos of both species have functional teeth at one point in their development (meaning teeth are erect and hard).  However, unlike in C. taurus, which eats its siblings early on, C. carcharias and I. oxyrinchus form functional teeth later in development.  In a study I did some thirteen years ago (damn, time flies...) on two sister species from the same family (lamnidae), Lamna ditropis and Lamna nasus, I found that mid-term embryos actually develop two fang-like teeth, one on either side of the lower jaw, while term embryos had a full set of functional teeth.  Back then, I called them eulabetic (lat. hold fast) teeth, since we assumed that their function was to aid the embryo in holding on to the egg capsules it consumed in utero.  It would be interesting to see whether C. Caracharias and I. oxyrinchus likewise have eulabetic teeth as mid-term embryos, but it is not easy getting embryos of either.  And since we didn't observe any in the embryos we had (which were about the same developmental phase as the L. ditropis we looked at), I think that eulabetic teeth are actually one of the autapomorphies of the genus Lamna.\n\nWell, as I said, just a bit of an addition to the excellent answer of Calimecita.  A friend once asked me how to tell makos and great whites apart.  I told him that the overall headshape is slightly different, to which he said that he can't see the difference on pics or film...  I mentioned the eyes and coloration, but neither were clear enough for him.  Finally I mentioned,, that the dentition is rather specifi for both species.  Makos have elongated slightly curved teeth in the lower jaw, while great whites don't.  His response: "Listen, if I see the teeth it's too !@#$$% close!"  Good point.\n\nThanks for the fun question! Always good to get an elasmobranch question in here.
189839
I was on the pier fishing on the bottom. If you fish you know that you have to keep the line tight so you can feel a fish when he bites. Suddenly a bird flew around us who were fishing ,hovered over my line and landed on it, kinda like on a clothes line.It continued to set there long enough for a man to take 4 flash pictures,it was nightime, then the bird flew away and I turned to ask the man to send me a copy of the pictures but he was gone also.Just that quick.