The Asian Journal of Animal Science

Nilesh Sawant ¹, Ashish S. Mohite ²

Affiliations
1 Department of Fisheries Engineering, College of Fisheries, Shirgaon, Ratnagiri (M.S.), IN
2 Department of Fisheries Engineering, College of Fisheries, Shirgaon, Ratnagiri (M.S.), IN

Abstract

The present study deals with the design and technical aspects of high opening bottom fish trawl (119 m) locally know as 62 Angali Disco Dol, operated along the Ratnagiri coast of Maharashtra. The material used for the fish trawl is HDPE (High Density Polyethylene) and the knot type used for construction is a single trawl knot. Blue colour multifilament netting twine was normally used, having twine diameter of 1.50 mm for construction of netting of wing and Square section, 1.25 mm for belly; while 1.0 mm twine was used for part of belly, lengthener and cod end section. The mesh size of the wing and square section was 1200 mm and reduced down to the cod end section (18 mm). The net was specifically used to catch Ribbonfish, Squid, Croaker, Pomfret etc. at a depth of 20 to 40 fathoms.

Keywords

Trawling, High Opening Fish Trawl, 62 Angali disco dol.

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Shreyas Khatavkar ¹, Ajay Desai ¹, Ashish S. Mohite ¹

Affiliations
1 Department of Fisheries Engineering, College of Fisheries, Shirgaon, Ratnagiri (M.S.), IN

Abstract

Gill net is one of the popular fishing methods along the west coast of India. However, there are regional variation in the design, construction and operation. The present study deals with design, technical specification and operation of Shark gill nets operated off Satpati, Maharashtra. Shark set gill nets were made up of Polyamide (PA) multifilament of diameter 210x4x3 to 210x6x3 mm. Green and red coloured twine was commonly used for the main webbing in Satpati. The mesh size used for this gill net ranged from 90 to 100 mm for the main webbing having. The hanging co-efficient ranged between 0.39 to 0.50 and the hung length varied from 25 to 30 m and the total hung depth varied from 5.07 to 6.15 m. The fleet length of Shark gill net ranged from 2375 to 2875 m. The depth of the operation for Shark gill nets ranged from 60-90 m and were operated as bottom set gill net.

Keywords

Gill Net, Design, Shark, Shahenshah or Maghari, Scoliodon laticaudus.

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Mudassir Azhar ¹, Ashish S. Mohite ¹, Rahul Sadawarte ¹

Affiliations
1 Department of Fisheries Engineering, College of Fisheries, Shirgaon, Ratnagiri (M.S.), IN

Abstract

Study was carried out on the soil and water quality parameters of operational Brackish Water Shrimp Farms of Ratnagiri district, Maharashtra. The soil quality parameters like Texture, pH, Water holding capacity, Seepage rate and Bulk density whereas the water quality parameters are temperature, pH, DO and Suspended Solid, Alkalinity, Hardness, Ammonia, carbon dioxide and Salinity. The soil pH ranged from 7.3 to 7.6. The bulk density was 1.164 g/cm³ to 1.462 g/cm³. Water temperature ranged from 28°C to 30°C. The level of the Water pH ranged from 7.4 to 8.0, whereas the salinity of water ranged from 15 to 35 ppt.

Keywords

Shrimp Farm, Soil Quality, Water Quality.

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Mayuri Dongare ¹, Ashish S. Mohite ¹, Makarand Sharangdhar ¹, Shrikant Sharangdhar ²

Affiliations
1 Department of Fisheries Engineering, College of Fisheries, Shirgaon, Ratnagiri (M.S.), IN
2 Department of Fish Processing Technology, College of Fisheries, Shirgaon, Ratnagiri (M.S.), IN

Abstract

The present study encompasses the traditional fishing method of Van net practiced in Ratnagiri, Maharashtra. Temporary barrier locally known as Van net was a very simple method employed to trap the fish and operated at a depth of 3 to 4 m. The gear comprised of a long wall of netting supported by head rope, foot rope and wooden sticks or bamboo poles at regular intervals and operated in the area of tidal influence. PE multifilament twine having specification ranging from 210D×6×3 to 210D×12×3 and mesh size varying from 20 to 35 mm was commonly used for construction of main webbing. Total hung length and hung depth ranged from 200 to 355 m and 2 to 3.8 m, respectively. Number of meshes in length and depth ranged from 6428 to 13000 and 70 to 190, respectively. PP twisted rope of 1.5 to 2.5 mm diameter was used as head rope on upper edge and foot rope on lower edge. A total 25 to 45 wooden poles of 3.5 to 4.5 m height and 40 to 60 mm diameter were used to stretch the long wall of webbing horizontally and vertically as floats and sinkers were not used.

Keywords

Traditional Fishing Methods, Temporary Barriers, Van Net.

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Kalpesh Shinde ¹, Ashish S. Mohite ²

Affiliations
1 Department of Fisheries Engineering, College of Fisheries, Shirgaon, Ratnagiri (M.S.), IN
2 Department of Fisheries Engineering, College of Fisheries, Shirgaon, Ratnagiri (M.S.), IN

Abstract

The overall length, breadth and depth of FRP gillnetters in Ratnagiri varied from 4.57 to 13.00 m, 0.84 to 3.55 m and 0.46 to 1.22 m, respectively. FRP gillnetters were motorized/mechanised and were either fitted with inboard or outboard engine, having horse power ranging from 3.32 to 99.27 hp with an average speed of 3 to 7 km. The gross tonnage ranged from 0.32 to 8.87 t. FRP inboard engine gill netters above 9 m OAL length, had half or full cabin. Construction of cost of 9 to 13 m length FRP gillnetter, ranged from Rs. 1.80 to 6.30 Lakhs and had an average life of 35 to 40 years. All the FRP gillnetters were built using the female mould technique.

Keywords

Gillnetters, FRP, Design, Technical Aspects, Construction.

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