वेरावल, गुजरात के तटीय समुद्र के विलीन पोषक तत्व और प्राथमिक उल्पादकता

कृपया पूरा लेखा पढ

Record size of (Carrot tongue sole) Cynoglossus dubius, caught off Veraval, Gujarat

The largest ever recorded tongue sole (Cynoglossus dubius) from Indian waters was landed by a monofilament gillnet at Veraval Fishing Harbour in Gujarat

Monsoon fishery of juvenile ginger prawns at Little Rann of Kutch, Gujarat in relation to environmental parameters

Juveniles of ginger prawn, Metapenaeus kutchensis (George, George and Rao, 1963), form monsoon fishery in shallow estuarine waters of the Little Rann of Kutch. The catch data were collected from Tikar, Mandrakhi, Cherowari and Surajbari landing centres during 2004 to 2009. The annual average catch was 2406 t, of which the bulk was contributed by Mandrakhi and Tikar. The catch correlated well with the amount of rainfall (r = 0.97). The length-weight relationships were expressed as: Log W = -2.367 + 3.1204 log TL for males (r = 0.81) and Log W = -2.868 + 3.7098 log TL for females (r = 0.88). All the water quality parameters including ammonium nitrogen, nitrate nitrogen and phosphate phosphorus were within safe limits and congenial for growth of ginger prawn juveniles and post-larvae. The water and sediment bacteriology revealed that both proteolytic and lipolytic bacteria were present in considerable quantities for efficient recycling. The chemical and biological parameters of water apart from monsoon rains, appear to contribute to the rapid growth of this species from post-larvae to juveniles

Plastic debris in the stomach of a Longman’s Beaked Whale, Indopacetus pacificus (Longman, 1926) stranded off Sutrapada, Veraval, Saurashtra coast, India

Longman’s beaked whale or the Indo- Pacific beaked whale (Indopacetus pacificus) is a rarely occurring whale with very poor information on sighting or stranding, though more common in western Indian Ocean region. Threat to marine fauna from the ingestion of plastic carry bags and other non-biodegradable debris scattered on the ocean surface and at the seafloor is increasing at alarming proportions. This communication describes the stranded adult female Longman’s beaked whale near off Sutrapada, Veraval, Gujarat coast that has presumably been choked to death due to the ingestion of four thick plastic bags, which was revealed from the autopsy conducted by the Gujarat Forest Department and the Wildlife Treatment Centre, Sasan Gir, Gujarat

Fishery and stock estimates of the silver pomfret, Pampus argenteus (Euphrasen), landed by gill netters at Veraval

The fishery and population characteristics of silver pomfret Pampus argenteus (Euphrasen) caught by gillnetters off Veraval were studied for the period from 2003 to 2007. The average annual landing of P. argenteus was 114.5 t, which contributed 4.5% to the total gill net catches. The period from July to September was the most productive in terms of catch and catch rate. The length–weight relationship showed that the growth was isometric. The sex ratio was 1.75 in favour of females. Mature females occurred throughout the year, with maximum during June – November. The length at first maturity of female was 27.5 cm. The von Bertalanffy growth equation was: Lt = 41.57 [1 – e - 0.64 (t + 0.0315)]. The length at first capture (Lc) was 8.2 cm with recruitment taking place throughout the year with two peaks during February-March and in August. The natural mortality (M), fishing mortality (F) and total mortality (Z) were 1.20, 2.11 and 3.31 respectively. The exploitation ratio (E) was 0.64. The Maximum Sustainable Yield (MSY: 90 t) was lower than the average annual catch indicating over-exploitation of the species. The yield per recruit (Y/R) and biomass per recruit (B/R) was 38.31 g and 18.16 g respectively. An increase in relative yield by 17.18% would be obtained by decreasing the present level of fishing by 60%

Flourishing trade of air bladders at Okha, Gujarat

The swim bladders of eels (Muraenesox talabonoides Bleeker), ghol (Protonibea diacanthus Lacepede) and koth (Otolithoides biauritus Cantor) are of best quality and fetch very high market price owing to the huge export demand. Fish air bladder is mainly used for making isinglass. Considerable quantity of eel, ghol and koth are landed at Okha by trawlers operating on the rocky bottom (18 m depth) off Jakhau. Around 500 trawlers having an overall length of 40 to 45 ft, powered with 80 - 105 HP engines are actively engaged in the fishing of eel, ghol and koth. The fishing trip lasts for 7 - 10 days with 4 - 6 hauls of 3 h duration per day depending on whether they fish during only day or both day and night. The trawlers carry on an average 10 to 12 nets having length of 35 - 40 m with cod end mesh size varying between 8 and 15 mm

Occurrence of a large cornet fish, Fistularia petimba in trawl catches of Veraval coast, Gujarat

A large cornet fish (Fistularia petimba) belonging to the family fistulariidae was collected on 3rd February 2009 from the Bidiya Fish Landing Centre, caught by trawler off Veraval coast at a depth of 60

Unusual heavy landings of the catfish Arius dussumieri in Rajapara Bay of Gujarat coast

Rajapara is one of the most important dolnet fishing centres in Saurashtra region and the landing centre is a small semicircular bay without any major concrete berthing facilities (Fig. 1). Though, a well constructed jetty is not present in this centre, fishing boats of 10 -14 m size operate and small canoes are used to unload the catch. About 240 dolnet units are under operation, of which 120 are four netters, 90 are three netters and the rest are two netters. Duration of each operation lasts for 4 to 5 h. Depth range of fishing ground is 24 to 40 m and it takes 4-5 h to reach the fishing area