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Fishing methods


Fishing with pots is used by the method of 'longline'. The total length of the main rope (thickness 8.7) is about 11 km and the distance between the pots is about 35 meters. In equal distance between them, floats will be placed and a sinker lead holding rope near the bottom, in order to monitor the tool. The total number is 300 pots. Each has a distance of 2 meters from the main rope. The shrimps will be attracted to bait traps consisting of sardines, mackerel, skipjack and butts, and which will be placed in a barrel under the sun to be fermented. Flour will be added and mixed.

Pots

Two kinds of pots will be constructed: i) spheroidal of three (3)  different mesh sizes (8, 11, and 15 mm), nylon netting for adjusting the size and ii) square or rectangular (11 and 15 mm). The basis of both types of pots will be constructed of
wire and the outlet opening will have a diameter of 13 cm. In each dump tool of three hundred (300) pots, five (5) pots of any shape and size will replace the existing professional tool by using square pots with 11 mm mesh size.

Seasonal Design
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The arrests will take place during night hours (20:00-08:00) from January until December 2014 on a monthly basis to all stations. After 10-12 hours, all pots will be collected and the fish will be covered with ice before being transported back to the laboratory of the Hydrobiological Station of Rhodes. All the shrimp catch will be kept on ice until the identification of the species’ level the gender, the length (carapace length; LC, mm) and the mass (g). To better expedite the process on board, sample of the total catch of 200 species will be measured for carapace length and weight.
For the histological analysis 80 gonads and eggs during the breeding will be placed in formalin from two stations (Symi and Karpathos) and stomachs from 50 species per sex (100 total) will be removed for further analysis Each and every stomach gonad will be frozen and will be given for histological analysis individually getting all the details of the type and method of capture. Each sampling will measure the temperature and salinity to the depth of 600 meters by using the system of the CTD W / EU ALKYON.

Bathymetric design

Three hundred (300) pots will be placed in the depth range 0-600 m., randomly distributed in three bathymetric strata 0-50, 51-200, below 200 meters. This provision is based on the thermocline which is created in the south-eastern Aegean area, at 35-45 meters depth and will enable us to study the shrimps' movements.

Underwater measurements

For better capture of the shrimp’s movements, underwater observations will shear (SCUBA census technique) and will be used for recording shrimps which live in caves in shallow depths during the summer months. The technique of underwater observation will take place throughout the duration of the sampling period.
 

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