Suurpetopoikkeuslupapäätökset | Suomen Riistakeskus

Kaikki Suomen Riistakeskuksen suurpetopoikkeuslupapäätökset vuodesta 2012 tähänpäivään.
Lähde: Suomen Riistakeskus – Suurpetopoikkeusluvat

Kategoria(t): Riistanhoito

Suurpetohavainnot kartalla | Riistahavainnot.fi

Kaikilla on mahdollisuus seurata valtakunnallisen petoyhdyshenkilöverkoston Tassu-seurantajärjestelmään kirjaamia tietoja karhujen, susien, ilvesten ja ahman jälki- tai näköhavainnoista.

Osoitteesta riistahavainnot.fi voi katsoa kirjatut merkinnät kahden viimeksi kuluneen kuukauden ajalta, niistä tuoreimmat voivat olla edelliseltä päivältä.

Suurpeto havaintosi voi pelastaa monen lemmikkieläimen hengen
> tästä löydät paikallisen petoyhdyshenkilön.

Toimi näin:
– tallenna petoyhdyshenkilön puhelinnumero kännykkääsi
– lähetä viesti petoyhteyshenkilölle heti kun teet havainnon
– kerro tai kuvaa – mitä, missä, milloin näit. GPS sijainti tuo lisäarvoa.

Petovahingosta tulee ilmoittaa viipymättä vahinkopaikkakunnan maaseutuelinkeinoviranomaiselle!

Petovahinkokorvausta haetaan lomakkeella 131 kotikunnan maaseutuelinkeinoviranomaiselta.

Riistahavainnot — suurpedot.

Tallenna

Kategoria(t): Riistanhoito

Metsästysajat

Metsästysajat 2016 – 2017

Kategoria(t): Riistanhoito

22 important things to know about choke | Shooting UK

A choke constricts the muzzle of your gun and tightens the pellet pattern. A wide or restricted pattern could make a difference to your shooting. ’Could’ is however the operative word.

  • By swapping chokes, you can use the same shotgun for a variety of different disciplines
  • But most of us don’t shoot well enough to get any real benefit from choke
  • Screw-in chokes arrived in the late 1970s with the Winchester 101 series of guns
  • Good technique and practice are the secrets of good marksmanship rather than chokes
  • Almost every Gun will suffer from a bout of chokechanging-itis
  • Frantic choke changing rarely helps accuracy
  • Novice shooters should forget excessive choke and concentrate on ensuring that patterns are adequate at 40 yards and not over-tight.
  • Look at the patterns to see what choke works best in your gun
  • Tight patterns may give clean kills at long range but at short distances they demand more accuracy
  • Quarter and quarter or half and half is a good choke for pigeon shooting
  • Clean chokes from time to time by immersing in petrol
  • Always throw away a damaged choke
  • Check that your chokes are screwed home fully before using
  • Check chokes are free of foreign bodies like grit
  • The threaded section of multi-chokes should be lightly greased with Vaseline or equivalent before being screwed home
  • Beware of over-tightening chokes
  • If a choke gets stuck, don’t force it. Take it to a gunsmith for removal.
  • Multi-chokes sit in a section of the muzzle that has been specially machined to receive them.
  • Multi-chokes need to be cared for to remain trouble-free
  • Multi-chokes must be screwed in sufficiently so no gap remains between the inside of the barrel and the base of the choke section
  • If a tiny gap does remain serious damage may occur to the gun- this is called “choke pick-up”
  • Multi-chokes have become very popular, both as factory standard and as custom attachments from specialist makers.

Lähde: 22 important things to know about choke – Shooting UK

Kategoria(t): Riistanhoito | Avainsanat: , | Kommentoi

Ilveksen ja ketun pyynti tunneliloukulla

Värmlantilainen tunneliloukku on 3,5 – 4 metriä pitkä pyydys. Se rakennetaan paikanpäällä pysyväksi rakennelmaksi.

Tärkeintä ilveksen metsästyksessä on, että pyydys on sijoitettu oikeaan paikkaan. Paikkaan, jossa ilves kulkee usein ja ainoa tapa on seurata ilvesten liikkeitä. Ilvekset merkitsevät reviiriään virtsalla.

Pyyntivälineet on sijoitettava siten, että ilveksen on helpompi mennä sen läpi kuin kiertää sen ympäri. Jos maastossa on luonnolliset rajat ansan sivuilla, näillä voi ohjata ilves pyydystä kohti. Nämä voidaan tehdä pienistä puista ja pensaista.

Värmlantilaisen tunneliloukun osaluettelo.

Kategoria(t): Riistanhoito | Avainsanat: , , , , , , , , , , , | Kommentoi

Giant octopus suffocates foolhardy dolphin that tried to eat it | New Scientist

A dolphin in Western Australia has bitten off more than it can chew. An attempt to eat a large octopus turned fatal when its airway was obstructed by a mass of tentacles.

The Indo-Pacific bottlenose dolphin – known as “Gilligan” to researchers in the area – was found dead on Stratham Beach near the port city of Bunbury in August 2015. Octopus arms were seen hanging out of the side of its mouth.

A post-mortem examination revealed one octopus tentacle extending down the dolphin’s oesophagus, and the other seven stuck in the back of its throat. The tentacle suckers were gripping the throat walls and had blocked off the airway, causing the dolphin to suffocate.

The tentacles belonged to a Maori octopus (Macroctopus maorum), the largest species of octopus found in Australian waters and the third largest in the world.

It is not unusual for bottlenose dolphins to feed on octopuses, but they normally break the body and tentacles into smaller pieces first using a “shake-and-toss” method. Shaking the octopus helps to kill it and tear it apart, while tossing prevents it from latching on and also weakens the suckers.

Down in one

Gilligan’s downfall was trying to swallow the 2.1-kilogram octopus whole without proper preparation, says Nahiid Stephens at Murdoch University in Perth, Western Australia, who performed the post-mortem. “We assume it simply wasn’t broken up adequately,” she says.

It would not be the first dolphin to make this mistake, Stephens says. Park rangers along the coast of Western Australia have described similar octopus-related deaths in dolphins and sea lions, she says.

Dolphins in other parts of the world have also had a hard time with octopus prey. For example, in 2012 a bottlenose dolphin in Greece was observed with an octopus clasped to its genitals.

But even though hunting octopuses is risky, there are also benefits. Large, muscular octopuses provide a robust meal full of high-quality proteins. They are also easier to catch than fish, because they tire quickly during pursuit, especially after they’ve finished breeding.

“Their consumption must generally be a risk worth taking, although it did not play out well in this individual’s case,” says Stephens.

Journal reference: Marine Mammal Science, DOI: 10.1111/mms.12420

Lähde: Giant octopus suffocates foolhardy dolphin that tried to eat it | New Scientist

Kategoria(t): Riistanhoito | Kommentoi

Nuori saksalaisnainen muutti laavulle keskelle suomalaismetsää – aikoo selviytyä syömällä itikoita, puolukoita ja kovakuoriaisia

Charlotte Arnswaldin ensimmäinen yö laavulla keskellä yläsavolaista korpimetsää oli koettelemus.

Ulkona oli seitsemän astetta pakkasta, eikä nainen voinut nukkua aivan nuotion vieressä, ettei makuupussi olisi palanut.

Parin yön jälkeen nainen keksi laittaa nuotioon kiviä.

Laitoin kuumat kivet makuupussiin lämmittämään jalkojani. Sen jälkeen alkoi mennä paremmin, Charlotte virnistää.

23-vuotias yliopisto-opiskelija tuli Suomeen saadakseen luontokokemuksia ja päästäkseen syvemmälle omaan itseensä.

Ajattelin, että voisin ymmärtää itseäni paremmin ja nähdä asioita ihan uudella tavalla.

Myöhäinen kevät pilasi etukäteisopiskelun

Charlotte halusi kokeilla myös sitä, miten hän pystyy pärjäämään luonnossa sen omilla ehdoilla.

Naisen alkuperäisenä tarkoituksena oli metsästää tarvittava ravinto, mutta siitä ajatuksesta Charlotte joutui luopumaan jo varhaisessa vaiheessa.

Aseen kuljettaminen olisi vaatinut lupaa eikä Suomessa ollut enää edes metsästysaika.

Ruokavalio monipuolistuu kovakuoriaisilla ja itikoilla

Charlotte oli vielä Saksasta lähtiessään kasvissyöjä, mutta ei enää nykyisin. Ylivuotisten puolukoiden lisäksi hänelle kelpaa nyt niin kala kuin lähes mikä tahansa muu, mitä luonnosta suinkin vain löytyy.

Jopa sammakot maistuisivat, jos niitä vain saisi kiinni. Sammakonkutu ei päässyt karkuun, joten paistoin sitä nuotiossa, hän nauraa.

Kutu ei Charlotten mielestä maistunut ollenkaan niin pahalta kuin miltä se näytti.

Lähde: Nuori saksalaisnainen muutti laavulle keskelle suomalaismetsää – aikoo selviytyä syömällä itikoita, puolukoita ja kovakuoriaisia | Yle Uutiset | yle.fi

Kategoria(t): Riistanhoito | Kommentoi

Villisian ”loukkupyydys” aitaus

Villisika on vaikeasti pyydystettä riistaeläin.

Ruotsissa on kehitetty villisikalauman pyydystämiseen sopivia loukkuja. Kahdeksan kulmainen loukku on elementtirakenteinen, joten se on helppo siirtää ja koota uuteen paikkaan.

Panthera Multitrap

Villisiat houkutellaan ansaan syötin avulla.

Melkein pyöreässä ansassa villisiat eivät törmää seiniin, siten siat pyörii ansassa ympyrää. Ansa on 120 cm korkea.

Yläosa on taivutettu pienessä kulmassa sisäänpäin jolloin villisikojen on vaikea kiivetä ansasta pois.
Kiinteäseinä tarjoaa suojaa auringolta ja tuulelta.

Portit avautuvat sisäänpäin, joten eläimet eivät pääse karkaamaan ansasta ja eläimien siirtäminen elävinä on mahdollista.

VillisikaAnsaVillisian metsästys on haastavaa, sillä älykäs eläin on vaikea yllättää tavan omaisessa metsästyksessä.

Helposti siirrettävä pyyntiväline voidaan siirtää, sinne missä lauma on havaittu.

Isokokoinen ansa mahdollistaa koko lauman houkuttelun ansaan, jolloin villisikakannan hoito on tehokaampaa. Voi olla, että pyyntilaitteille löytyy investointitukea riistanhoitoyhdistyksille tehokaampiin villisikakannanhoitomenetelmille, nyt kun pyritään ennalta ehkäisemään Afrikkalaisen sikaruton (ASF) leviämistä.

Tavanomaiset ansat villisika oppii nopeasti välttämään, kun jouku eläin laumasta jää satimeen.

 

Erimallisia villisian pyyntiaitauksia

Kategoria(t): Riistanhoito | Kommentoi

Guide to shotgun choke. Everything you need to know.

What a shotgun choke is, what the choke does, how it affects your shooting and how to both choose and measure your shotgun choke.

Shotgun choke can become something of an obsession. But it can make all the difference to your shooting. So if you want to know which choke to use for which gun, which choke to use for high birds, and when to stop tinkering, read our guide…continued below.

And if you like what you see then why not take out a subscription to The Field as a New Year’s resolution to embrace everything really rural? Subscribe before January 31st to take advantage of our super New Year offer.

WHAT IS SHOTGUN CHOKE?

Shotgun choke is the constriction at the muzzle end of the gun that tightens the pattern of pellets. In an average cartridge there are approximately 300 pellets, so how wide the shot pattern or how restricted is a matter than will make all the difference to your shooting.

There is no need to become neurotic about shotgun choke, even though some people do. What is most important is that regular misses in the field are rarely down to choke. The cause is far more likely to be the direction the barrels are pointing.

Choke is one of those things, like gunfit, that should be visited occasionally and put out of mind once an informed decision has been reached concerning what best suits your needs.

With that on record, let us move forward.

DOES YOUR SHOTGUN CHOKE WORK FOR YOU?

You should take your gun to a pattern plate (or improvise one with paper or card sheets and a suitable frame and safe back-drop) and shoot it at different ranges – 20yd, 30yd and 40yd – using the cartridge you prefer. You hope to see an even pattern without too many clusters, gaps or excessive central concentration.

If there are holes a bird could fly through – a 5in circle test is sometimes applied – or if the pattern is obviously too tight, your shotgun and its chokes may be working against you.

Once you have tested with your usual ammunition, experiment with different cartridges. You might, for example, try to observe the terminal effects of switching between fibre and plastic wads (the former often throw more open patterns) or increasing pellet payload (which may be an alternative to increasing choke). If your gun has multi-chokes, try different tubes.

The tools of the trade for measuring shotgun choke

REVERSE CHOKE

Sportsmen develop strange prejudices concerning shotgun choke. My approach, and I happily admit to passing through the stage of confusion, is practical. I have discovered what works for me in different situations and now stick with it. For general game-shooting, I like a bit of choke in the first barrel but not too much – it is the first few thou that makes the most obvious difference. A slightly choked barrel is much more efficient than a true cylinder and inspires confidence, too.

Many 12- and 20-bore game guns are over-choked for their task. Tight patterns may be a means to cleaner kills at longer range but they are an impediment at shorter distances because they demand more accuracy.

There seems to be something in many sportsman’s psychology that erroneously suggests more choke good, less choke bad. If you are going out on the average driven day or walking-up, you do not need much choke in a 12-bore.

The first few thou does make a real difference; thereafter the law of diminishing returns takes effect. Those who can see shot will confirm this. You can often observe what looks like a tennis ball-sized cluster of shot moving past the bird at short range. I have seen this many times and thought: “It’s much tighter than I expected, one might as well be using a rifle.”

Some years ago, I put together what came to be called my “duffer’s gun” based on an old, plain-Jane Beretta Essential over-and-under. The initial idea was to create a workhorse without regard to aesthetics that would be as forgiving to shoot as possible on normal days. It was based on an over-and-under because, though I love side-by sides, over-and-unders are usually easier to control and easier to point. The Beretta action is supremely reliable, moreover, and the Essential, though a budget gun, had livelier barrels than the average because it dispensed with side ribs.

The gun was a multi-choked model and this allowed for much experiment with shotgun chokes at the pattern plates and, later, in hides and on the shooting field. After some months of experiment, I determined that I had the most consistent first-shot success with something called a Seminole spreader choke. This device is made in the USA. It might be described as a reverse choke: it has a section that extends from the muzzles and trumpets out to a greater size than the bore.

The form of this section is conical. The concept of reverse constriction is not new. In the muzzle-loading era, before the general adoption of choke boring, many guns were “relieved” at the muzzles because it was found that they shot better than a true cylinder. My experience would seem to confirm this; the Seminole choke still works on clay birds 50yd out, yet it is very forgiving close in.

The second shotgun choke that worked really well in the field – in that it was effective and forgiving in use – was a standard Beretta Improved Cylinder Mobilchoke tube. This is a conventional shotgun choke with about five thou of constriction. With the duffer’s gun, I once accounted for 18 average pheasants for 17 shots.

They were not testing, but it really was quite difficult to miss with it. I have since lent it to friends in distress and they have always shot it better than other, more traditional weapons. I have had similar unnatural success with another open-choked Beretta over-and-under using mid-velocity, heavy payload cartridges (11⁄4oz, No 6).

The gun and the cartridges were lent to me in Italy. It was extremely effective on easy birds but the experience was notable because the 36g cartridges had a lot of shot in them but did not recoil excessively (the lower velocity, heavy-payload cartridge was explored by the wildfowler Dr Charles Heath years ago).

OPEN CHOKES?

Does this mean that everyone should open up their chokes? No, not unless one is shooting at close- to mid-range birds routinely. Shotgun choke can certainly be useful when shooting at longer range its effects break down at extreme range and if birds are especially tough – such as wild guineafowl in Africa.

A bit more choke than is really required may also in-crease confidence – no small factor in shooting – and give one the sense if not the actual ability to pick one’s birds better. If your confidence slips because of concerns about choke, or anything else, your focus may come off the bird and your movements may be hesitant (resulting in misses behind).

WHAT CHOKE FOR HIGH BIRDS?

Nigel Teague, a man who has experimented more with shotgun choke than perhaps anyone else in Britain today, advocates 7⁄8ths of choke – about 35 thou – in both barrels for the really tall stuff. This concurs with my high-bird experience where I have found three-quarters and three-quarters works well in a 12, better than full and full. With many modern cartridges optimum pattern performance requires less than full constriction; excessive choke can blow a pattern.

Many foreign guns, especially small bores, may be ridiculously over-choked. This stated, I think 20s and, especially, 28s perform a bit better with a little more shotgun choke than I would advocate for a 12. My 30in Beretta EELL 28-bore, for example, shoots particularly well with two three-quarter chokes fitted (about 20 thou constriction in a 28).

Although, one can try to state general principles concerning choke, I find that some guns just seem to shoot well with a particular constriction and there is no real science – none that is available at least – to support why this should be.

Shotgun ballistics are much more complex than one might think because there are so many variables: atmospheric conditions; shot size; shot density; shot coating; wad, primer, powder and case type; barrel diameter (a nominal 12 might be anything from .710 to .740 in internal diameter) and internal geometric form; barrel steel and wall thickness; and, not least, the length and form of the choke constrictions themselves.

Some chokes are short, others long. Some are simple conic constrictions, others have a cone that leads into a parallel section, yet others have complex forms, including features such as radiused walls, relieved sections or expansion chambers.

While we are getting technical, let me note that tight shotgun choke increase pressures, and hence velocity. A point of choke is worth about 1ft per second on velocity.

As barrel length has a small effect on velocity too – about 5fps per inch in a 12-bore – this may become more significant when extremes of choke and barrel length are combined. For example, it is interesting to note that a 32in full-choke gun might have a velocity as much as 100fps faster than a 25in open-bored one, all other things being equal.

Most intriguingly, constriction of the muzzles also has the effect of reducing the stringing of shot once it is significantly forward of the muzzles (just forward of the muzzles there may some elongation of the shot column, but the terminal effect of choke is to reduce the length of the shot string and thus improve its efficiency).

This may seem counter intuitive but it was neatly demonstrated by Mr Griffiths of the Schultz Powder Company more than a hundred years ago by means of shooting choked and unchoked guns at a spinning disc. The results were published in The Field, like much else concerning choke and shotgun ballistics in the Golden Age.

CHOOSE YOUR SHOTGUN CHOKE AND FORGET IT

Cutting to the chase and avoiding the danger of getting too complicated, my all-round choice in a 12-bore game-gun would usually be improved and half or improved and three-quarters (a useful choking if combined with the instant selection of a double trigger).

I would not argue with those, such as my friend and former Olympian Kevin Gill, who advocate quarter and half for all-round shooting. (Kevin shifts to half and three-quarters for higher birds.) My rationale is that I like to engage average birds instinctively but it is also good to have the option of a more precise approach at range.

CHOKE FOR HIGH BIRDS

Two tight but not extreme shotgun chokes are in order (teamed with a high-performance cartridge; the choke may never be separated from the cartridge used with it).

CHOKE FOR PIGEON

Quarter and quarter or half and half usually works well. For smaller bores my preference is a bit more choke than commonly advised. I have to say, though, that I have not a clue what is in my 32in Guerini 20s, the guns I use most for game. I put the chokes in some while back after playing at the plates and have not looked at them since. They work.

MEASURING SHOTGUN CHOKE

A shotgun multichoke

Commonly, one refers to the choke in a barrel as being true cylinder, improved, quarter, half, three-quarter or full. Gunmakers talk about “points” of choke. They measure shotgun choke relative to the bore diameter (which may vary considerably within any designated bore size rather than at the muzzle alone).

One point equates to a constriction of one thousandth of an inch. Below is what one would expect in a 12-bore gun.

  • True Cylinder 0-1 points
  • Improved cylinder 3-6
  • Quarter (American Improved) 8-12
  • Half (American Modified) 17-23
  • Three-quarters (Improved Modified) 25-30
  • Full 35-40
  • Super full 40+

These descriptions should not be appraised in isolation of their observed effects, though. Properly considered, choke concerns the number of pellets any given barrel/constriction throws into a 30in circle at 40yd.

The quality of shot, the type of wad and other factors such as precise bore diameter and the form of choke – short or long, simple conic or conic cone plus parallel section (the favourite of British gunmakers) may all be significant.

Percentage of pellets inside
30in circle at 40yd

  • True Cylinder     30-40
  • Improved           50
  • Quarter             55
  • Half                  60
  • Three-quarters   65
  • Full                   70-75
  • Super full           76+

Shotgun choke can be definitively determined only at the pattern plates and in relation to a specific cartridge. Measurement of constriction alone can be misleading. In days past, a gunmaker would always ask his client what cartridges he intended to use and then regulate the chokes according to the desired percentage.

If the client opted for the gunsmith’s own brand, he would have to continue to use the gunmaker’s cartridges to ensure consistency of performance.

Lähde: Guide to shotgun choke. Everything you need to know. | The Field

Kategoria(t): Riistanhoito | Avainsanat: , | Kommentoi

Sammakon limasta löytynyt aine pelasti koe-eläimet tappavalta influenssalta – iskee samaan kohtaan kuin kehitteillä olevat yleisrokotteet

Sammakon limasta on löydetty aineita, jotka tappaa useita ihmisen influenssaviruksia.Tutkijat eristivät Etelä-Intian Keralassa elävästä, nyrkin kokoisesta Hydrophylax bahuvistra -sammakosta kaikkiaan neljä viruksia tuhoavaa ainetta.

He antoivat sammakolle lievän sähköiskun, jolloin se alkoi erittää ihostaan limaa. Sitten tutkijat keräsivät liman talteen ja katsoivat, mitä siitä löytyy.

Kaikkiaan limasta löytyi 32 erilaista puolustuspeptidiä.

Peptidit koostuvat samoista rakennuspalikoista kuin proteiinit eli aminohapoista, mutta ovat proteiineja pienempiä.

Neljä peptideistä tehosi ihmisen influenssaviruksiin. Kolme niistä osoittautui kuitenkin myrkyllisiksi, kun niitä testattiin ihmisen punasoluihin.

Yksi aineista oli vaaraton ihmissoluille ja tuhoisa viruksille. Tutkijat nimesivät sen urumiiniksi perinteisen keralalaisen urumimiekan mukaan.

Urumiini teki monia influenssaviruksia vaarattomiksi

Kun ainetta tappavan inluenssatartunnan saaneille hiirille, ne selvisivät taudista.

Urumiini tepsii H1-tyypin viruksiin. Esimerkiksi maailmanlaajuisen sikainfluenssaepidemian vuonna 2009 aiheuttanut virus on tätä tyyppiä.

Urumiini näyttää iskevän viruksessa samaan kohtaan kuin kehitteillä olevat yleispätevät influenssarokotteet. Kohde on viruksen pinnasta töröttävä hemagglutiini, jolla virus tarttuu kiinni soluun.

Hemagglutiinia tarkoittaa myös H-kirjain viruksen nimessä. Se ei muutu niin paljon kuin virusten muut osat. Siksi tutkijat pyrkivät kehittämään rokotetta, joka perustuu sen tunnistamiseen.

”Urumiini kiinnittyy hemagglutiiniin ja tekee viruksen epävakaaksi. Sitten se tappaa viruksen”, selittää yksi tutkimuksen tekijöistä, Emory-yliopiston professori Joshy Jacob tutkimustiedotteessa.

Tarvitaan vielä paljon kehitystyötä ennen kuin urumiinista on influenssalääkkeeksi. Monet peptidit hajoavat elimistössä, kun entsyymit käyvät niihin käsiksi.

Jacob ja kumppanit aikovatkin selvittävää, miten urumiinin saisi pysymään vakaana elimistössä.

Tutkimuksen julkaisi Immunity-lehti.

Lähde: Sammakon limasta löytynyt aine pelasti koe-eläimet tappavalta influenssalta – iskee samaan kohtaan kuin kehitteillä olevat yleisrokotteet – Tiede – HS.fi

Kategoria(t): Riistanhoito | Avainsanat: , | Kommentoi