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ThesisItem Open Access “LENGTH - WEIGHT RELATIONSHIP AND BIOLOGY OF Wallago attu (FRESH WATER SHARK) FROM BHADAR RESERVOIR’’ 2923(JAU, JUNAGADH, 2019-08) HARI PRASAD; A. Y. DESAIThe present study on Wallago attu was conducted Bhukhi village Dhoraji Taluka of Rajkot district of Gujarat at Bhadar reservoir. Biological information on W. attu such as length-weight relationship, food and feeding habits, sex ratio and fecundity were collected from the Bhadar reservoir gear used by giilnet. The maximum size 109.5 cm was founded during investigation of research. The length weight relationship for males and females were not significant. The condition factor female was higher than male. The overall sex ratio was 1:1.008 and the females dominated in the population during entire investigation. All Maturity stages where founded during study period. The spawning percentage was higher during in month of August because only one breeding season attained by W. attu. The absolute fecundity of W. attu ranged from 16565 – 29883. The annual average ova diameter was 1.38 mm (range 1.1 – 1.9 mm). The GSI of the species was higher in month of August. The Gastrosometic index (GaSI) of the male and female was higher in February and September because it directly relationship between GIS. During breeding season the size of gonad was high so its preferred less food. The percentage of empty stomachs was the highest (26.67%) in July, and the percentage of full stomachs was highest (50%) in February and absent in month of breeding season. The Chanda nama and M. rosenbrgii were the favorite food of W. attu are because it founded to entire season. Morphometric parameters with total length show positive allometric growth for W. attu. The water quality parameter like Temperature, pH, DO. Alkalinity and Hardnees it directly or indirectly relation between them and survivability of W. attu fish. Suggestion to reduce catch of small size fishes for future sustainability and re recruitment.ThesisItem Open Access FISHERY, BIOLOGY AND POPULATION DYNAMICS OF Epinephelus diacanthus (Valenciennes, 1828) LANDED AT VERAVAL, GUJARAT 3015(JAU, JUNAGADH, 2019-09) RAMCHANDRA KHILERI; A. Y. DesaiAugust to November months i.e., the post monsoon and winter seasons were the most productive periods in terms of catch and catch rate of E. diacanthus at Veraval. The length of the species during the study period ranged from 121 mm (in March, April and October) to 506 mm. The present study establishes that the slope of regression equation for E. diacanthus was significantly (5%) different from the isometric value of 3, indicating a negatively allometric growth for the species. The overall sex ratio for E. diacanthus was 1: 2.06. Females dominated in all size classes up to 45 cm and their percentage varied from 54.55 to 76.64%, while males became dominant after 45 cm. E. diacanthus spawned throughout the year with the peak in August-December. The size at 50% of E. diacanthus matured in the population was 262 mm. Absolute fecundity of E. diacanthus ranged from 58,806 during April to 2,24,640 in August. The average fecundit y determined for the study period of one year was 1,25,253. The estimated ova size of E. diacanthus ranged from 252 to 384 µm. Month wise GSI was calculated and it was found to be higher in September, October, November and December. The diet of E. diacanthus included Ambassis sp., Bregmaceros sp., Leiognathus sp., Prawns, Crab, Sepia, Squilla, Gastropods, Octopus, Copepods, Bivalve, Lucifer Sp., Eggs and Larva of fishes, digested fish and shrimp. The asymptotic length, growth coefficient, and age at zero length were respectively, 526 mm, 0.36 and - 0.0729 years. The growth performance index was 5.0. Recruitment ii pattern was trimodal with its peak during May to June and August to September. The total, natural and fishing mortality were 2.20, 0.41 and 1.80, respectively. The exploitation ratio and rate of exploitation was 0.82 and 0.869, respectively. The annual total stock, biomass and MSY were 32446 t, 26583 t and 29241 t, respectively. The yield and yield per recruit at the present fishing effort was 22031.92 t and 65.13 g, respectively. The exploitation of the species at Veraval is above the sustainable level. The fishing pressure has to be decreased by 20% from the present condition for the sustainable fishery.ThesisItem Open Access LENGTH – WEIGHT RELATIONSHIP AND BIOLOGY OF Nemipterus mesoprion (Bleeker, 1853) LANDED AT VERAVAL LANDING CENTER,3014(JAU, JUNAGADH, 2019-10) GOHEL KIRAN RATANSHEE; H. K. KardaniThe present study on Nemipterus mesoprion was conducted at Veraval landing center of Gujarat. N. mesoprion collected from the trawlers were used for study of biological information such as length-weight relationship, food and feeding habits, sex ratio and fecundity. Mainly multi-day fleet of trawlers are used for exclusively collection of samples. The highest length of the fish was observed 257 mm during November month while lowest length was observed 77 mm during February month, with a mean length of 155 ± 22 mm. The length weight relationship for males and females were significantly different. The overall sex ratio was 1:1.05 for male and female. They spawned throughout the year with the peak in September and November. The 50% of the individuals matured when their body measured a total length of 170 mm. Gonadosomatic index was the highest during November. The Gastrosometic index of the male and female was higher in August and September. Fish and Crustacean especially Acetes spp. And Penaeid Prawns were the common dietary component. The percentage of empty stomachs and one fourth stomachs were present in all the months with high percentage. Fecundity of the species was ranged from 10464 to 53072. The estimated size of ova ranged from 101 to 650 µm. The present investigations will helpful to provide baseline data for the conservation and management of this fishery resource for future outlook.ThesisItem Open Access ICHTHYOFAUNAL DIVERSITY OF KADANA RESERVOIR, GUJARAT, 3012(JAU, JUNAGADH, 2019-09) MUNIYA TORAL NAVALSING; H. K. KardaniThe present study deals with ichthyofaunal diversity of Kadana reservoir, Gujarat. Sampling was done at every month during July 2018 to February 2019. Total 32 species from 6 orders, 13 families and 22 genera were recorded during the present study. Cypriniformes was the dominant order in term of species diversity (12 species) followed by Siluriformes (10 species), Perciformes (6 species) and Synbranchiformes (2 species) and Osteoglossiformes and Beloniformes were represented by 1 species each. Dominant families were Cyprinidae (12 species) followed by Bagridae (4 species), Siluridae and Channidae (3 species), Mastacembelidae (2 species), 1 species of Claridae, Heteropneustidae, Schilbeidae, Cichlidae, Ambassidae, Gobiidae, Belonidae and Notopteridae families. Total of 32 species of fishes were recorded during study period. Out of these 1 species comes under vulnerable status, 27 fish species comes under status of least concern, 1 fish species comes under data deficient status and 4 fish species comes under near threaten. During month of February highest fish diversity was found. Average fish diversity was found during month of July and lowest diversity was found during the month of November. The range of different physico chemical parameters were observed such as water temperature 25oC – 32oC; pH 8.5– 9.2; Dissolved Oxygen 7.2 – 8.3 mg/l; Total alkalinity 172 – 189 mg/l; Total hardness 162 – 174 mg/l. This is first ever study on the fish diversity of Kadana reservoir and would help in explore the fish fauna of Kadana reservoir.ThesisItem Open Access STUDY ON SOME BIOLOGICAL ASPECTS OF CRAB, Portunus sanguinolentus (Herbst, 1783) LANDED AT VERAVAL COAST, GUJARAT 3010(JAU, JUNAGADH, 2019-08) PARGI NARENDRAKUMAR ARJUNSINH; D. T. VaghelaThe biological study on Portunus sanguinolentus was conducted at Veraval coast of Gujarat. It is exploited by the use of trawler throughout the year during August to March month at Veraval coast of Gujarat. The biological information of crab such as length - weight relationship, food and feeding habits, sex ratio and fecundity were collected from the multiday trawler operated along Veraval coast of Gujarat. The highest observed length of the crab was 270.2 mm with a mean length of 109 ± 26 mm. The overall sex ratio was 1:1.14. They spawned round the year with its peak during August and September. Absolute fecundity of the species was 7,44,900 - 6,02,910. Gonadosomatic index was the highest during March. Gastrosometic index was highest during November. Fish and Crustacean were the most preferred food item than other food items. The present investigations will helpful to people by providing the baseline data for the conservation and management aspects of the fishery resource for future purpose.ThesisItem Open Access STATUS OF SEAWEED FLORA AND BIODIVERSITY OF ASSOCIATED SHELLFISHES FROM INTERTIDAL ZONE AT OKHA (GULF OF KACHCHH), GUJARAT 3003(JAU, JUNAGADH, 2019-09) DAVE TUSHAR HARESHKUMAR; D. T. VaghelaThe “Gulf of Kachchh” is one of the prospective areas in India for the rich growth of seaweeds. It holds a zone of 7300 km2 comprising a system of creeks, marshy tidal flats, and rocky coral reefs which deliver promising environment to a wide variety of seaweeds. The Coast of Okha (22°28’N and 69°05’E), at the mouth of “Gulf of Kachchh” on the northwesternmost part of Saurashtra in Gujarat is characterized by rocks made up of tertiary formations alternating with patches of sand deposits, semi diurnal tides, gradual slope towards seaside, no direct in-flush of freshwater and many rockpools making the area more hospitable for the growth of many seaweed throughout the year. The present study aimed to observe intertidal seaweeds assemblage formations, identification of assemblage forming biota and changes in species composition because of seasonal changes and zonal preferences. The survey included vertical dispersal of seaweeds and associated shellfishes to observe patterns of assemblage formations and descriptive analysis which delivers an outline of reference in terms of diversity at different zones, dominant biota and geographical preference of the assemblages. First , 1.1 km long and 900mt wide coastal stretch were divided vertically into three zones viz. Zone01 (0-250mt), Zone02 (250-500mt) and Zone03 (500-750mt) based on distance from the highest high tide line to the seaside. The annual survey with the random quadrate method revealed the presence of 39 species of seaweeds and 26 species of shellfishes. The seaweed individuals and associated shellfishes attached with seaweeds, beneath the seaweed turfs or canopy, and nearby were counted for the study. The one-way ANOVA analysis of seaweed assemblages showed significant differences in mean population densities in different seasons and at zones. The multiple regression analysis with the help of F-test applied to analyze the impact of changes in seaweeds densities and composition over the shellfish diversity. The impact of environmental factors on seaweeds species composition in community formations and assemblage formations with shellfishes calculated with multiple regression analysis. The calculations and graphical presentations of the similarity distance matrix revealed a preference of habitats by seaweed assemblages for the different zones and seasons. The ordination techniques PCA applied to explore major axes of variation in the species × factor data matrix and CCA applied for the analysis of the particular combination of biological and environmental measurements on species.ThesisItem Open Access “ANALYSIS OF TRACE METAL CONCENTRATION IN HARBOR WATER AND SEDIMENT OF VERAVAL COAST, GUJARAT” 3001(JAU, JUNAGADH, 2019-09) MALAMDI MAYUR TULSIDAS; D. T. VaghelaThe present study on trace metal concentrations in water and sediment was conducted at Veraval, Coast Gujarat. The purpose of study was to measure the increasing concentration of metals in habor. The analysis of concentrations of trace metals (Cd, Cu and Zn) at three different stations in Veraval harbour was done under MP-AES. Some physico-chemical parameters such as pH, Salinity, Temperature, TSS and DO2 were recorded in different seasons for eight months. The highest concentration of Cd in sediment was observed in Post-monsoon season (0.72 ± 0.049) at Station-3 in November and in water the levels of Cd was not detected. In case of Cu the highest concentration in sediment recorded in Post-monsoon season (307.70 ± 41.81) at Station-3 in December Zn had the highest concentration in sediment in Post-monsoon season (704.92 ± 176.2) at Station-3 in December. The concentration of Cu in water was highest in Pre-monsoon season (1.65 ± 0.282) at Station-2 in November. The concentration of Zn in water was highest in Post-monsoon season (3.32 ± 1.060) at Station-2 in November. It was noted that the highest concentration of all three metals Cd, Cu and Zn in sediment occurred at Station-3 during Post-monsoon season and lowest at Station-1 during Monsoon season. Thus, results revealed that seasonal variation in trace metal concentrations was observed in all stations.ThesisItem Open Access “RICHNESS AND DISTRIBUTION OF COMMERCIALLY IMPORTANT FINFISHES AND SHELLFISHES OFF VERAVAL COAST ON GIS PLATFORM” 3025(JAU, JUNAGADH, 2019-11) PANJA TEHSEEN HAMID; A. Y. DESAIThe present study was conducted to understand promising fishing grounds of Commercially important Finfishes and Shellfishes using GIS mapping method. The precise data in the form of geographical coordinates of fishing and allied information on the time of fishing, depth of the fishing area, catch details, etc. in a structured schedule were collected from the identified multiday trawlers operated along Veraval coast of Gujarat. Information was then mapped on GIS platform to get the promising fishing grounds and the spatio-temporal distribution of different groups of fishes. The favourable fishing grounds for Croakers and Threadfin breams with highest CPUE were in areas of Veraval-Mangrol, Dev-bhoomi Dwarka and Porbandar whereas lowest aggregation was seen in areas off Vanakbara, Diu and Mumbai at the depth range of 50 – 150 m in the post monsoon and winter months. These fishes during the premonsoon months moved towards Mumbai - Ratnagiri and less CPUE was observed in areas of Veraval and Diu. The favorable fishing ground was along the southern Saurashtra coast i.e., below 19˚48' N having deeper waters (> 50 m), which resulted in relatively higher CPUE in all the seasons. Unicorn Leather jacket was abundant in waters of Saurashtra during the post monsoon and winter months where as in pre monsoon season the CPUE was high in Maharashtra waters. The favorable fishing grounds for Cephalopods were located along the south off Girsomnath district and off Daman coast at a depth range upto 30 m , which resulted in moderate to high CPUE in all the seasons. A seasonal variation in the area of distribution of the fishes was also observed.ThesisItem Open Access STUDY ON SOME BIOLOGICAL ASPECTS OF CRAB, Portunus sanguinolentus (Herbst, 1783) LANDED AT VERAVAL COAST, GUJARAT 3010(JAU, JUNAGADH, 2019-08) PARGI NARENDRAKUMAR ARJUNSINH; D. T. VaghelaThe biological study on Portunus sanguinolentus was conducted at Veraval coast of Gujarat. It is exploited by the use of trawler throughout the year during August to March month at Veraval coast of Gujarat. The biological information of crab such as length - weight relationship, food and feeding habits, sex ratio and fecundity were collected from the multiday trawler operated along Veraval coast of Gujarat. The highest observed length of the crab was 270.2 mm with a mean length of 109 ± 26 mm. The overall sex ratio was 1:1.14. They spawned round the year with its peak during August and September. Absolute fecundity of the species was 7,44,900 - 6,02,910. Gonadosomatic index was the highest during March. Gastrosometic index was highest during November. Fish and Crustacean were the most preferred food item than other food items. The present investigations will helpful to people by providing the baseline data for the conservation and management aspects of the fishery resource for future purpose.
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