Reduction In Fisheries Research Articles

Some points of catch structure and population parameters of the Black-Azov Sea pontic shad during the period 2004–2020

Long-term data collected in the proccess of scientific monitoring of commercial fisheries in the Kerch channel of the Black-Azov sea pontic shad in period 2004–2020 was analyzed. Static and dynamic parameters of population was evaluated. Von Bertalanffy growth model parameters estimated: Linf = 32,0 cm, K = 0,31, t0 = -2,09. Age and weight cohort structure of commercial fisheries in investigation period was estimated. Following results of assessment on fisheriesbiological data, including accounting surveys and surplus production modeling results, the Black-Azov sea pontic shad (r. Don) stock status describe by reduction in fisheries biomass with stable catch structure and level.

Level of Awareness on Disaster Risk Reduction of the University of Eastern Philippines Employees and Students

The researchers looked at how well academics, students, and non-teaching staff at the University of Eastern Philippines System were aware of disaster risk reduction. Education, agriculture, health, fisheries, and marine resources were all used to measure awareness. The research also revealed a link between awareness and a number of personal characteristics, as well as a substantial variation in awareness amongst student groups. The study used a 30-item Likert type instrument to assess disaster risk reduction awareness and used a descriptive-correlational research approach. Percentages, means, multiple regression analysis, and analysis of variance were used to examine the data. The study's findings revealed that faculty members were well-versed in disaster risk reduction in education, agriculture, and health, as well as disaster risk reduction in fisheries and marine resources, infrastructure, and the environment and natural resources. The students were well-informed on disaster risk reduction in the areas of education, agriculture, and health, as well as disaster risk reduction in the areas of fisheries and marine resources, infrastructure, and the environment and natural resources. The six components of the degree of awareness were known to the non-teaching employees. Exposure to newspapers and television was shown to be substantially associated to the level of disaster risk reduction knowledge among faculty and non-teaching personnel. Students' newspaper exposure and year levels were shown to be substantially connected to their degree of disaster risk reduction knowledge. There is a considerable variation in disaster risk reduction awareness across the three categories of respondents.

Effect of Fisheries Subsidies Negotiations on Fish Production and Interest Rate

We analyze the effect of fisheries subsidy negotiations on financial markets and aggregate demand in developed and developing countries. We examine the plausible scenarios that are likely to emerge in the event of elimination or reduction of subsidies, and the subsequent effect on the financial markets and the fish production. We use the Keynesian macroeconomic static framework, which is based on an extended well-known investment-savings (IS) and liquidity preference–money supply (LM) model for analysis. Our analysis shows that the impact of a reduction in fisheries subsidies would reduce the exploitation of fish and marine resources in developing countries, thus leading to a general increase in fish prices and quantity stabilizing at lower levels. We also find that this effect would transfer to financial markets, leading to a decline in interest rates for fish exporting developing countries, but interest rates tend to stabilize at higher levels for fish importing developed countries.

Great Black-Backed Gull (Larus marinus) Predation on Seabird Populations at Two Colonies in Eastern Canada

Abstract. The increase in gull (Laridae) populations through the 20th century, largely due to an upsurge in anthropogenic food sources, has raised concerns about the effects of gulls on sympatric populations of other seabirds. In Newfoundland and Labrador, Canada, a reduction in fisheries discards due to the collapse of cod (Gadus morhua) populations and a phenological delay in the early 1990s and early 2000s in spawning capelin (Mallotus villosus) has supposedly resulted in increased seabird predation by gulls. Accordingly, the diet of Great Black-backed Gulls (Larus marinus) was quantified at two colonies (Gull Island, Witless Bay, Newfoundland, and Gannet Islands, Labrador), and the total mortality on sympatric breeding seabirds at each site was extrapolated. At the Gannet Islands, Great Black-backed Gulls primarily kleptoparasitized Atlantic Puffins (Fratercula arctica) bringing sandlance (Ammodytes sp.) to their chicks, whereas at Gull Island, seabirds formed the bulk of the gulls' diet. Great Blackb...

Infestation with larvae of the sea anemone Edwardsia lineata affects nutrition and growth of the ctenophore Mnemiopsis leidyi

SUMMARYThe lobate ctenophore Mnemiopsis leidyi is a periodically abundant and voracious plankton predator in coastal waters along the east coast of the United States. In the 1980s it was accidentally introduced to the Black Sea where it caused a dramatic reduction in fisheries. We investigated how M. leidyi is affected by infestation with parasitic larvae of the sea anemone Edwardsia lineata. Infested M. leidyi contained 1–30 (median 7) E. lineata larvae. Within M. leidyi most larvae had their mouth in the gastrovascular system near the aboral end of the pharynx. Parasitic E. lineata ingested all food previously ingested and pre-digested by M. leidyi. Non-infested M. leidyi had higher growth rates than infested individuals, which had zero or negative growth rates. Egg production was similar for infested and non-infested M. leidyi of similar size. Simulation based on the empirical data suggests that growing, non-infested, M. leidyi are expected to have a larger life-time egg production than infested shrinking individuals. E. lineata could be at least partially responsible for the sharp decline of M. leidyi populations in fall in US coastal waters. Advantages and disadvantages of E. lineata as a potential candidate for the control of the artificially introduced M. leidyi population in the Black Sea are discussed.