Archer fish can shoot down insect prey with a sharp jet of water. Fish usually fire from positions that are not directly below their target so that a dislodged insect falls ballistically with a horizontal velocity component. Only 100 ms after the insect is on its path both the shooter and other school members can initiate a rapid turn and then head straight in the direction of the later point o...

The human species descended most probably from an early primate that lived and collected its food in shallow marine waters some 7 to 9 million years ago. The evolution of our brain and species has always been closely related to the resources of the ocean. Methods for catching fish have been known since the earliest days of mankind, involving spearing, harpooning, trapping, catching with hooks, ...

The ability of bats to prey on the insects and catch fish on thewing bymeans of echolocation is remarkable, since the acoustic power transmission through air–water interface is very small. A mathematical model describing the way in which a bat can detect fish under the water surface is suggested in this article. The problem of scattering of the spherical acoustical wave from the water with the ...

Boat lift net is an active fishing gear that operates at night using a lamp whose light functions to attract pelagic fish. The purpose of this study determine the difference between catches two boat collecting lights different colors, research was held in Polewali Mandar waters September-November 2020 by following operation catching 2 units. results showed green caught 1876.6 kg more fish than ...

The studies were conducted during 2008–2010 to evaluate Fishery status and its bearing on socio-economic condition of Fishers Community of undivided Goalpara district of Assam. A total of 97 species belongs to 56 genera of 26 families were recorded from various fish landing centers of the region during study period. Fishers catch fish in the river throughout the year. However, fishing intensity...

Seagrass ecosystems are coastal with high species diversity, especially fish. Fish diversity determines the abundance of communities based on number species. Detection fish directly (in-situ) and conventionally by catching them requires more energy, costs, relatively needs time. Therefore a computer vision method is needed that can detect well using underwater images. The detection model used M...

The North-East Arctic cod (Gadus morhua) fishery, as most other commercial fisheries, is wasting the larger part of its potential. Examining a detailed multi-cohort, multigear bioeconomicmodel, we show that the cause is rather a too smallmesh size than excessive effort. Although internationally and nationallymanaged by quota allocations and regulations, the current exploitation pattern implies ...