Feeding and reproductive biology of Saurida undosquamis (Richardson, 1848) from Parangipettai coast, Southeast coast of India.
The feeding biology, spawning season, size at first maturity, sex ratio and fecundity of the commercially important lizardfish (Saurida undosquamis) were studied in Parangipettai waters of the southeast coast of India. Fishes formed the predominant food item. Diversity of the prey items showed maximum value (H'log 2-3.61 +/- 0.11) during the postmonsoon season and minimum during the monsoon season (2.89 +/- 0.17). The richness (1-lambda') also showed a similar trend and varied from 0.81 +/- 0.13 (monsoon) to 0.91 +/- 0.01 (postmonsoon). The size at first maturity (50% incidence of mature fish) was 195 mm. But when the size at first maturity was calculated by adjusting the proportion of maturity percentages, the maturity size was found to be 140 mm. This method is advantageous from the point of view of fisheries management as this species can be exploited above 140 mm rather than above 195 mm. The gastrosomatic index was found maximum during postmonsoon and minimum during the monsoon season showing the inverse relationship between feeding and spawning. This species was found to spawn from August to January with a peak in November. The fecundity ranged from 19, 856 in a fish measuring from 20.1 cm in length (97 g) to 79,282 in a fish of 29 cm (290 g). The overall sex ratio (1:1.19) was found to deviate significantly from the expected 1:1 ratio. (chi2 = 19.1, p < 0.005). Month- wise, it conformed to the expected 1:1 ratio during most of the months except January, June, September, November and December. Higher gonado-somatic index values observed during October-December suggested spawning activity during this period. This species is found to a total spawner in the Parangipettai waters.
Food And Feeding Habits of Two Major Lizardfishes (Family: Synodontidae) Occurring along North-West Coast of India Between Lat. 18°-23°N
Lizardfishes are commercially important group of species contributing to the fishery in the Indian EEZ. Information on predation, prey-predator relationship and their assessments in respect of Saurida tumbil and Saurida undosquamis have been derived in this study. A total number of 1630 specimens of S. tumbil and 926 of S. undosquamis were used for stomach content analysis. The specimens of S. tumbil examined in the study ranged between 13.0-53.0 cm (TL) and of S. undosquamis 13.0-41.0 cm. Qualitative and quantitative analysis revealed that the species S. tumbil prefers food in order of abundance as a teleost fishes (41%), molluscs (9.16%), shrimps (3.64%), crabs (1.41%) and squilla (0.37%) and S. undosquamis prefers teleost fishes (49%), molluscs (11%) and shrimps (3%). In S. tumbil, the highest feeding intensity observed in July (50%) and in S. undosquamis, in October (41%) and the lowest intensity recorded in the month of June for both the species. Monthly Gonado Somatic Index (GSI) shown that the highest feeding was observed in January (10.55%) and July (10.76%) for S. tumbil whereas, in case of S. undosquamis, the GSI was highest in August (16.58% for males and 17.80% for females). The pieces of sand granules, detritus and benthic organisms in the stomachs of the species indicating the benthic nature at the sea bottom in the search of food. Occurrence of juvenile lizardfishes in gut contents of both the species indicates that the lizardfishes are cannibalistic in nature. Key-wordsLizardfish, feeding intensity, Gonado Somatic Index (GSI), Cannibalism INTRODUCTION Lizardfishes belonging to the family Synodontidae and two lizardfishes Saurida tumbil and S. undosquamis are exploited on commercial basis in Indian waters. Food and feeding habits of fish provide the information on the food chain in a particular ecosystem as well as prey and predator relationship and seasonal variations in the diet composition. This information will give the understanding on the migration patterns, abundance and behaviour of the fish. Most of the fishes are highly adaptable in their feeding habits and utilise most of the richly available food . Access this article online Quick Response Code Website:
Struggles for Visibility
This article addresses the ways in which terrorists are rendered visible in the news media. By studying images used in coverage of terrorists, the article focuses on the visual construction of this figure, which symbolizes the public’s notion of the “enemy”, in terms of specific attacks and the general threat thereof as well as terrorist actors, networks, and ideologies. The article takes its point of departure in the assumption that two visual forms are prevalent for representing terrorists in the news media, “surveillance representations” and “self-representations”. Based on this assumption, the article is guided by a principal research question, namely: How are terrorists made visible in the news media through surveillance representations and self-representations and what are the prevalent genres for visually representing terrorist actors? The article draws on a theoretical framework concerning the news media’s propensity to personalize the terrorist and the mediated visibility of terrorists. Empirically, the article is based on a quantitative content analysis of coverage of terrorism by Danish public service broadcasters DR and TV2 in 2016 to provide an overview of the proportions between surveillance representations and self-representations and develop a typology of the most widespread genres: ID photography, surveillance footage, selfies and similar, and private snapshots.