Collecting water beetles

And mine was in a soil trap at the water's edge

They sent me ditiskus, which I caught for testing in October, but forgot at the base. Here is part of the material:

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I've been interested in this question for a long time: What is this whitish formation on the distal segments of the abdomen? Is it an organ or a fungus?

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Purebred!!! Why don't they show latissimus?

I came up with a new method for collecting water beetles in shallow puddles: a small piece of foam paste is taken, and explosives are attached to it (for example, a powerful firecracker)(it is better to fasten with tape), placed on the surface of the water and activated. As a result of the resulting shock wave, the beetles float to the surface, where they are easily collected by a water net. I would like to note in advance that this method is currently under development and has not been tested in practice. I am waiting for your feedback and suggestions. And finally, I attach a small drawing of this aztskoi machine.

  

Explanation of the drawing:
1. The surface of the water.
2. Foam raft.
3. Explosive device (firecracker).

This post was edited by Black Coleopter - 21.11.2009 22: 01

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Black Coleopter Water beetles are not fish to you, it is unlikely that they will float right up. In addition, fishing with dynamite is prohibited, possibly beetles too =)

But no one canceled the shock wave and, I think, it doesn't matter if it's a beetle or a fish

I've been interested in this question for a long time: What is this whitish formation on the distal segments of the abdomen? Is it an organ or a fungus?

According to E. N. Pavlovsky: "During copulation, the male transfers the spermatophore to the female's copulatory bag, after the bag closes and hides the spermatophore, a putty-like milky-white mass remains on the abdominal surface of the eighth segment of the female's abdomen, representing the "sign of female fertilization".

It looks like I've been misunderstood. No one calls for jamming large bodies of water with dynamite. This meant the use of ordinary firecrackers in small roadside puddles.

A foam raft will extinguish the shock wave of the firecracker...

A foam raft will extinguish the shock wave of the firecracker...

I also thought about it

I've been thinking about that too

I suggest using the "black death", and not just one, but a whole pack

This post was edited by Mantispid - 11/21/2009 22: 33

Paddle them on the head and in the stain. )))

Korotnev described the concept: fishing in gas reservoirs. Who knows what we're talking about??? Please tell us.

Good evening, everyone. I am, in a way, related to hydrobiology. In connection with my professional activity, I work on water bodies and have some observations. In particular, latissimus can be caught in small bodies of water. I fished in 1-hectare areas. According to my observations, the main condition for the success of its capture in such reservoirs is the presence of a large reservoir within a radius of 1-3 km.
In a week, I'm going to work on several such reservoirs. Floaters (small and large) come across a lot. I've never taken a small change before, but if there are any interested parties, I can pay special attention to this... moreover, it is free of charge, i.e. free of charge.
Photos of beetles will be posted in the second half of October, after their capture.

PS They say that the widest ones in Europe have not been seen since the middle of the last century. It's true?

Alexander, I live in the North Caucasus and I can exchange your swimmers for interesting species of beetles and butterflies that live here. Unfortunately, there is no e-meil in your data, otherwise I would have written it in a personal account. Please reply to serg384@yandex.ru

A neighbor in the dacha in the Volokolamsk district has a large inflatable pool and he constantly cleans it. A large net from leaves and insects. Water beetles often fly in. He gives me all of them with great pleasure, and not just water beetles. Large woodcutters often fall.

Dear colleagues, do you have any photos, or do you know the links in the Internet, where the collection of water insects is shown, respectively. with a net? I really need it, but I can't find it myself.

On 01.05.2006, my friends and I spent May Day at the dacha plot of one of us. It was a beautiful, warm, windless and sunny day. We were located at a distance of 400 meters from the river, in addition, there were enough temporary spring reservoirs in the area-barrels with meltwater. So, when I approached the car that was standing in the sun, I saw that its hood, trunk, and roof were strewn with floaters and other water beetles, which I immediately took advantage of. There were no Dytiscus(s), but there were many representatives of Acilius, Agabus (Gaurodytes), Colymbetes, Rhantus, Hydroporinae (especially!), pinworms, and small waterfishes. It is obvious that the flying beetles were attracted by the surface of the car sparkling in the sun, like a water surface, and they swooped down on this peculiar trap.

In my childhood (65-68 years of the last century), when we were driven to the May Day demonstrations, I saw a similar picture for several years in a row on the square, which was watered with water before the demonstration and puddles remained. It was into these puddles that divers and swimmers "rained" from the sky.

Here's another method I discovered by accident.
It is necessary to lay out pieces of ruberoyd on the country's freshly mown lawn in the afternoon. Later in the evening, they will be attacked by water beetles, which will immediately hide under them.

I dream of catching the only European psephenid Eubria palustris Germar, 1818 (Psephenidae). Has anyone encountered this beast?

Yes, I caught in Ukraine by mowing in wet meadows. From the Street. obl. like also seen in the fees.

Great, so there's a chance.

Elmid... The technique is simple - you use a net to lead against the current directly through the vegetation. One difficulty - the net must be very strong, I then did my own in the drizzle, the hoop was twisted into an eight...

As experience has shown, catching elmidae with a net is a thankless task. They sit firmly on the substrate and often in crevices. Only a small fraction of them get into the bag. Removing them manually from snags is much more efficient. Or did I do something wrong

Early summer

Spring


This post was edited by botanque - 09.11.2010 12: 40

And this is not Cybister's case???

Those are the ones. This year, three seabisters per ditiskus were caught.

Buzuluksky bor, 12.06.2010; ruch. Cholera.

Method of detection and collection of D. latissimus L.

The topic covered in the section "Images of insects" - "Water beetles" decided to move here, so as not to anger the moderators...
And so...

According to D. latissimus trapping methods: http://www.biology.lv/lv/files/Zinatne/Act...ogica_9_2/5.pdf

However, sorry incorrect English.. There are some lapses.

All these methods mostly concern collecting large beetles (limited only by the size of the grid cell). And since I study the biology of this species, I am most often interested in living specimens.
The methods are probably known to many..

Briefly:

Equipment:

- Hydrobiological net;
- Garden rake (small);
- Funnel-type traps (crustaceans) made of a mesh with a cell of 4-12 mm;
- Fishing nets made of fishing line. Cell size 18-22 mm;
- Flashlight;
- Fishing boots (preferably pants);
- Double rubber boat;

--- well, even a wetsuit can be (to be honest, I bought it in a fit of enthusiasm.... truth..I didn't have to..wait for beetles in it..) But the idea was probably sound.

Additional special equipment in winter:
Tools for making holes and ice holes:
- Peshnya, kolovorot, chainsaw
(we do not forget about warm clothes or you never know what else)

Method of detection and collection of D. latissimus.

1. Visual survey of the shoreline of a reservoir and its shallow water areas is carried out from the shore or from a boat. In the daytime, as well as at dusk and night with a flashlight. Trapping animals is done manually or with a net. We will also apply the method of" mowing " with a net. In some cases, plants with egg-laying plants are collected using garden rakes (if it is necessary to preserve the root system of the plant).

1.1. Collecting eggs. Collection time: April-early May. Prospective plants such as Carex acuta, Carex rostrata, Caltha palustris, etc. are collected and then visually examined.
Suitable plants are found in beetle breeding areas (most often on the sunflower side along the shore of the reservoir). The collector wraps his fingers around the underwater part of the stem of the found plant almost at the very base and, slowly, passing it through his fingers in the upward direction, feels it out. The stem of the plant, which has neoplasms in the form of characteristic bulges, in most cases, guarantees the presence of clutches. The stem is normally smooth and often flat. In plants such as Caltha palustris, the fleshy stem is also visually examined for reliability, since the eggs may lie in the thickness of the stem. This is evidenced by the characteristic incisions. Stalks with masonry are carefully pulled out and placed in plastic bags for transportation. Transportation is carried out in special thermal boxes to avoid overheating (in clear weather, the interior and luggage compartment of the car gets very hot (Valērijs Vahruševs, 2009)).

1.2. Collection of newborn larvae. Time of capture: May 7-15 (for this reservoir, the larvae of the broad swimmer come out). The time of incubation and release of course varies from latitude, etc. Was carried out in the daytime in sunny weather. Newborn larvae were collected in the beetles ' breeding grounds. The method consists in the following: Slowly sailing by boat along the thickets of sedge, carefully examined the underwater parts of plants, etc. substrates on which the larvae could sit. Sometimes, to detect larvae, a useful action was to move the surface parts of plants or a sharp short tap on them with your hand or any improvised object. Disturbed larvae begin to move and often break away from their perches, making them easier to spot.

2. Collect beetles with traps. Time to set traps: spring, summer, autumn, winter. Crustacean traps are installed with bait (usually pieces of fresh beef heart, fish (herring (Clupea sp.), whiting (Micromesistius)). A series of traps in the amount of 15-21 pieces were installed at a distance of 5-8 meters from each other. One edge of the trap should always be raised above the water, so that the insects caught in it can breathe. Special attention should be paid to this issue in the summer-warm time.. In late autumn and winter, at low temperatures from +7 and below, the traps can be completely submerged under water, since the metabolism of insects is not so intense. Traps are checked at least once a day in summer. In late autumn and winter, the traps were checked once a week.
Advantages of mesh traps over all-plastic ones: The mesh provides good water passage through the trap, avoiding stagnant areas inside it. And this is extremely important when catching large swimmers. In the summer months, in the sun, in warm water, traps can be clogged with hundreds of these beetles. Beetles under stress often secrete a repellent secret. Accumulation of this secret in plastic traps in combination with overheating can cause the death of beetles, which is completely excluded in gear made of mesh materials. Thus, mesh traps reduce the stress of the animals in them and improve survival.

I would like to mention winter hunting.. during the overseas period (February-March). (see photo). In this case, fresh air can serve as an additional bait.
Sometimes, at the beginning of March, we found Dytiscus sp. (circumcinctus?) right on the ice near the cut holes. I assume that the beetles went out on the ice not only to breathe but also to bask in the sun.

3. Collect beetles with fishing nets. Fishing line nets with a mesh size of 18-22 mm are used. Installation time, late autumn, early winter. . They are placed along the shore or in "windows" among aquatic plants. "Windows" can be prepared in advance using a dredge or other tool. The installation method is generally accepted. (Valērijs Vahruševs, 2009). As you know, during this period, beetles have a mating season. Often there are pairs in the network. Males entangling females get confused... when releasing insects, it is important not to miss the female. (it is held only by the male).

By installing these gear sets, the researcher takes serious responsibility for the welfare of the animals caught in them. For in addition to the desired swimmer, the traps may contain accompanying-other types of animals of the studied biocenosis. Therefore, traps are checked no later than once every two days, ideally once a day (during the summer season). Networks are set up overnight and checked twice a day. In nets with such a cell, it is almost impossible to cause damage to fish stock. Large fish in such a net does not linger, as the fishing line is easily torn. Such a collection method requires serious responsibility and authorized action with the permission of environmental authorities.

4. Survey of fishermen. The territories of many reservoirs are a favorite place for fishermen to relax. The survey is conducted selectively and anonymously. Thanks to the information received from the fishermen, we received important information about how to detect and collect the studied species.
Fishermen are told the essence of the problem and the area of our interests, with illustrations that clearly emphasize the characteristic features of this species.
Sometimes in the course of the conversation, in some cases, we managed to get information about the placement of fishing gear on the territory of reservoirs in which D. latissimus beetles were caught. This information allowed us to determine the distribution zones of the species within the ecosystems of some ponds.

You can try to catch swimmers in the light in early spring... when the ice just moved away from the shore. Everyone knows that swimmers are almost one of the first beetles to announce the arrival of spring . In our city, every spring, I look for floaters under the streetlights... Latissimus really didn't arrive.. I could have.. There were cases of latissimus arriving at the light in early May.. it's real but so rare. I know we only have one case. I myself have tried several times to shine repeatedly at the reservoir, in which I observe a strong population of the species.. Alas!. Bad luck probably. The beetle of course migrates..but it's probably early spring. At least the mass flight of other ditiskus to light was observed in early spring.
In the laboratory, after wintering, beetles try to get out on dry land.. on land at this time of year, it is often warmer than in the water.. they warm up and of course try to fly.

This post was edited by VaV-04.08.2012 22: 31

One of the options for installing gear in the ice hole.. In the second picture, though meager, but the catch. There were no special baits.
However, practice has shown that baits should also be laid in winter. For I have already seen that D. latissimus feeds "all year round"

This post was edited by VaV-04.08.2012 22: 38

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One of the options for installing gear in the ice hole.. In the second picture, though meager, but the catch. There were no special baits.
However, practice has shown that baits should also be laid in winter. For I have already seen that D. latissimus feeds "all year round"

my friend and I caught 20 pieces without bait at all, just combing the bottom near the shore through a hole punched in the ice

The collector
D. latissimus???

  The collector
D. latissimus???

Long ago, in my childhood, I discovered a barbaric method of fishing for aquatic fauna - someone threw a vegetable oil bottle into a large puddle, in which some of the liquid remained. The oil film killed all living things in the puddle, and to my surprise, I collected five large swimmers from the surface. I didn't use this method myself, but I saved it in memory.

my friend and I caught 20 pieces without bait at all, just combing the bottom near the shore through a hole punched in the ice

Can I go into a little more detail? Depth, time, extent, thickness of ice? Is the place familiar? do you catch beetles there regularly? What caught that? Have you ever seen any other species?

Long ago, in my childhood, I discovered a barbaric method of fishing for aquatic fauna - someone threw a vegetable oil bottle into a large puddle, in which some of the liquid remained. The oil film killed all living things in the puddle, and to my surprise, I collected five large swimmers from the surface. I didn't use this method myself, but I kept it in my memory.

Yes, this is probably one of the reasons for the death of swimmers when they are kept in an artificial environment (on the topic of aquaterrarium technologies). The presence of fatty and bacterial films on the water surface is strictly prohibited....

Can I go into a little more detail? Depth, time, extent, thickness of ice? Is the place familiar? do you catch beetles there regularly? What caught that? Have you ever seen any other species?

well, it was near the shore of the lake, the depth is not more than a meter, the ice is accordingly not very thick(20 cm), I do not remember the time(end of winter-beginning of spring), A friend lives there nearby, he may be familiar, he called me, but there are several species caught, latissimus, and a couple of females from the genus Dytiscus, Acilius, and Colymbetes

even here is the point 51.747209, 39.132753

This post was edited by Collector - 13.08.2012 21: 29

well, it was near the shore of the lake, the depth is not more than a meter, the ice is accordingly not very thick(20 cm), I do not remember the time(end of winter-beginning of spring), A friend lives there nearby, he may be familiar, he called me, but there are several species caught, latissimus, and a couple of females from the genus Dytiscus, Acilius, and Colymbetes

even here is the point 51.747209, 39.132753

Very Interesting! Thanks! Than pulled that? And what is the length of the section?

Very Interesting! Thanks! Than pulled that? And what is the length of the section?

aquarium net on a rail, length 0, because there was a small hole in the ice, 20 cm in diameter, as far as the net got there and dug the bottom