On the occurrence of Decapterus macrosoma in trawl catches at fisheries harbour, Cochin

The scads (Decapterus spp.) locally known as 'Thiriyan' forms an important carangid fishery in 'trawls' at Fisheries Harbour, Cochin contributing about 45.09 and 60.67 % of the carangids caught in trawls during 1987 and 1988 respectively. D. macrosoma contributed upto 50% of the catches with the maximum catch per effort of 44.50 kg. This species represented by an abundant catch of juveniles and sub adults also contributing upto an estimated catch of 2,941 kg (catch/effort: 17 kg)

A CASE Study on Software Project Development Cost, Schedule & Effort Estimation

This paper theme is to provide a case study of Software Project Development cost, effort, and schedule estimation. From recent past, a remarkable research takes place in developing different techniques on software effort and cost estimation. Making estimation before start of any project is necessary to be able to plan and manage any project. The estimate is an intelligent guess for the project resources. Nowadays, software has become a major contributor to economic growth for any nation. Making an estimate before starting any software project is vital for the project managers and key stakeholders. Major project milestones such as project schedules, budgeting, resource allocation, and project delivery dates are set on theeffort and cost estimates. Thus, the reliability of the estimation leads any project success or otherwise fail. In this article, author's idea is to work with function point analysis and include the concept of workforce scheduling in a better way while taking the decision in the contract phase. That leads to strengthening the relations between the developer and the customer. Basically, size is a main measured unit of the software project. Based on the size and other functionalities, the software managers estimate the total effort required to develop the project. From the effort and work schedule, the total cost can be estimated.Â

Fishery and population dynamics of the obtuse barracuda Sphyraena obtusata (Cuvier) landed by trawlers at Cochin, south-west coast of India

Fishery and population characteristics of the obtuse barracuda Sphyraena obtusata (Cuvier) landed by mechanised trawlers off Cochin were studied for the period 2010-2012. The average annual landings of barracuda was 184 t of which S. obtusata formed 65%. Seasonal peak in catch and catch rate was recorded during August, followed by February and May. The von Bertalanffy growth parameters (VBGF) estimated using ELEFAN were L∞ = 34.2 cm, K = 0.71 year-1 and t0 = -0.0000000025. The lengths attained at the end of 1, 2, 3, 4 and 5 years were 17.4, 25.9, 30.1, 32.2 and 33.2 cm, respectively. Recruitment was almost round the year with a major peak during February-May and a minor peak during July, together accounting 80% of the total recruitment. Natural mortality (M), fishing mortality (F) and total mortality (Z) were 1.35, 1.54 and 2.89 respectively. The length at first capture was 23.5 cm (age 1.64 years). The optimum length for exploitation (Lopt) was 20.9 cm at the age of (topt) of 1.3 years. Mean size in the catch (25.1 cm) was higher than Lopt. The resource is being exploited at a level marginally higher than E50 (E = 0.53), indicating optimal exploitation. Though the annual average yield is only marginally (6%) higher than the MSY estimated, there is no need for reducing the fishing effort from the prevailing rate. Instead, as the yield and biomass per recruit and yield and biomass curves showed that the maximum yield and yield per recruit could be obtained by increasing the present level of fishing, marginal increase in the effort is prescribed to sustain the fishery

Stock dynamics of the brushtooth lizardfish Saurida undosquamis (Richardson, 1848) from a tropical multispecies fishery in the southeastern Arabian Sea

The brushtooth lizardfish Saurida undosquamis (Richardson, 1848) is a high trophic level benthic predator and is one among the most exploited demersal finfish species from eastern Arabian Sea by Indian trawlers. However, in recent years, the landings of many top predator fishes including S. undosquamis showed a declining trend resulting in a steady decline in the mean trophic levels of the fishes caught commercially in the region. We investigated the growth, mortality and stock dynamics of S. undosquamis harvested by mechanised trawls in the southeastern Arabian Sea, using length-based methods for the data collected during 2012–2016. Besides, Bayesian state-space implementation of the Schaefer model (BSM) and catch-based MSY (CMSY) estimation were also made using the data for the period 1985–2016. Total length of the fish ranged from 5.5 to 34.5 cm with average annual mean length of 22.0 cm during 2012–2016. The growth parameters L∞ and K were 37.3 cm and 0.41 year�1, respectively. The natural, fishing and total mortality coefficients were 0.92, 2.58 and 3.5, respectively and exploitation ratio was 0.82. The length at first maturity was estimated at 21.4 cm for females. The mean size in the catch is lower than the optimum length for exploitation. Fisheries reference points (MSY, Fmsy, Bmsy) as well as relative stock size (B/Bmsy) and exploitation (F/Fmsy) estimated from catch data and broad priors for resilience (r), implies an exploitation of 30% below Bmsy level. Results from the length-based Thompson and Bell prediction model indicates that reducing the present level of fishing effort by 40% would lead to a harvest of the species at a sustainable level. As “fishing down food web” is reported in recent years from eastern Arabian Sea, the exploitation of top predators need to be maintained at sustainable levels to prevent ecosystem changes along the region

Decadal analysis of the flatfish fishery of India

Decadal analysis of the flatfish fishery of Indi

Heavy landings of juvenile lizard fishes and silverbellies at Neendakara

On 25.2.2008, a heavy landing of lizard fish of about 1,000 kg along with silverbellies by trawlers was recorded at Neendakara (Fig. 1). The catch was from Chavara area (off Neendakara) caught from 10-20 m depth. Among the lizardfish catch, Saurida undosquamis and among the silverbellies, Leiognathus elongatus were the dominant species

कोचीन मात्स्यिकी पोताश्रय में वर्ष 2010 के दौरान अवतरण किये सुरा और शंकुशों की प्रचुरता और विविधता पर विशेष परामर्श के साथ केरल की उपास्थिमीन मात्स्यिकी

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FMEA and Fault Tree based Software Safety Analysis of a Railroad Crossing Critical System

Software for safety-critical systems must deal with the hazards identified by safety analysis in order to make the system safe, risk-free and fail-safe. Certain faults in critical systems can result in catastrophic consequences such as death, injury or environmental harm. The focus of this paper is an approach to software safety analysis based on a combination of two existing fault removal techniques. A comprehensive software safety analysis involving a combination of Failure Modes and Effects Analysis (FMEA) and Fault Tree Analysis (FTA) is conducted on the software functions of the critical system to identify potentially hazardous software faults. A prototype safety-critical system - Railroad Crossing Control System (RCCS), incorporating a microcontroller and software to operate the train on a track circuit is described