And if the names of carp fishing legends are associated with the use of pop-ups, it is not by chance. In many situations the floating boilies are formidable weapons, to carry out a presentation just above a carpet of weeds, on very muddy funds, or simply to position an isolated boilie in the zone of evolution of the carps, which let us recall it are extremely curious and opportunistic fish. Current use Specific to the use of pop-ups, many rigs have been developed (Blowback rid, D-rig, Spinner rig, Chod rig...). They are used most of the time when fishing is complicated, for example in early spring with single hook baits, or in the middle of summer when the water is very hot and carp are not feeding much. A single pop-up presented at the height of the fish passage can then bring a large number of starts, when all other technical approaches fail. But it is also possible to associate them with other baits on the same rig to balance a presentation. In this case, the aim is to obtain a density of the "hook + bait" set close to that of the water. When sucked in by the carp, this lighter rig will naturally go faster and further into the carp's mouth, ensuring a better anchorage of the hook and reducing the number of dropouts. To achieve this, pop-ups can be combined with seeds (cheat rig) or boilies (snowman rig).
Gregarious behaviour and congregation on holding areas. First of all, they don't move around much. Very often we see groupings (which can be very large) around what are called holding areas. In dams this corresponds to rocky screes, fields of submerged stumps, or deep, congested edges. They descend into the water layer to find a temperature less cold than at the surface, the thermal boundary between the very cold surface water layer and the warmer deep zone. This limit is called thermocline, and to reach it the carps do not hesitate to gather at a depth of 10 or 15 meters in a reservoir. In rivers they will occupy places sheltered from strong currents, protected by tree trunks or any other natural or artificial structure breaking the main current. This provides them with security and limits their energy expenditure, so precious in this season.
Carp feeding activity and oxygen levels in summer From a metabolic point of view, carp have an essential need for oxygen. If the water is too warm this dissolved oxygen level becomes very low, too low, it then virtually stops feeding. During the hottest hours of the day, schools of carp form around holding areas (shallows, patches of water lilies or pondweeds), or "in between waters" at the thermocline It is noted at this time that carp tend to become active at night, they particularly appreciate the proximity of living aquatic grass beds that release oxygen from their photosynthesis. It should be noted that in general carp are guided by three major tropisms, thermotropism by which they seek temperate waters, branchiotropism by which they seek well oxygenated waters, and finally trophotropism by which they seek areas rich in food. In the midst of a heat wave when oxygen is scarce, this combination is mainly found in well-vegetated, moderately deep areas with higher oxygen levels. In rivers in these hot conditions, fish will sometimes feed near pavements and other waterfalls, which will provide some oxygen. Summer showers and thunderstorms also get them active and if the low pressure lasts for several days, it will be all the better, no matter where you fish! So, surface manifestations (porpoises, jumps) are often observed or heard at night. But if the waters are too rough, they can be very active. But if the waters are properly oxygenated, carp fishing can be done in a fairly conventional way directly on the usual feeding areas, for example: in dammed lakes: stump fields, marked breaks, old river beds or submerged hedges, stone screes... in gravel pits and ponds: clogged areas, fallen trees, reed bed edges, gravel trays, silt pockets...