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Jan 11, 2018Open    AccessArticle

Sargassum, Gracilaria and Ulva Exhibit Positive Antimicrobial Activity against Human Pathogens

Amrit Kumar Mishra
Bacterial resistance to pharmaceutical drugs is on rise, which emphasizes the need for screening of new drugs from natural resources. Seaweeds from the marine ecosystem are important source of bioactive compounds making them one of the major subjects for screening of various pharmaceutical drugs. So here, we assessed the bacterial growth inhibitory functions of four seaweeds Sargassum wightii

Dec 29, 2017Open    AccessArticle

Knowledge of Climate Change and the Perception of Nigeria’s Coastal Communities on the Occurrence of Sargassum natans and Sargassum fluitans

Lucette Adet, Godwin Nmeka Nsofor, Kehinde Olufunso Ogunjobi, Brahima Camara
Climate change effects threat life on earth especially economically poor areas. Among them is noticed the shifting of the algae species Sargassum natans and Sargassum fluitanss seaweeds from the Brazilian coast to new areas along the West African coastline. Their occurrence along the Nigerian

Sep 19, 2017Open    AccessArticle

Are 20% B0, 20% Bunfished, and BMSY Valid as Reference Points for Fisheries Resource Management?

Kazumi Sakuramoto
The aim of this paper is to discuss the validity of 20% B0, 20% Bunfished and BMSY as reference points for managing fisheries resources. I reanalyzed eight stock-recruitment relationship (SRR) sets of data that were analyzed by Myers et al

Jun 19, 2017Open    AccessArticle

Clockwise Loops and Anticlockwise Loops Observed in a Stock-Recruitment Relationship

Kei Tanaka, Naoki Suzuki, Kazumi Sakuramoto
Loop-shaped trajectories are commonly observed in the stock recruitment relationship (SRR). A mechanism has been proposed that explains why the loops emerge in SRR. The aim of this study is to validate the mechanism using data for the stocks of 24 fish species that live in the waters around Japan. The following three questions are examined: 1) whether or not loop shapes are detected in SRRs for all 24 stocks;

May 23, 2017Open    AccessArticle

Correction of “A Recruitment Forecasting Model for the Pacific Stock of the Japanese Sardine (Sardinops melanostictus) That Does Not Assume Density-Dependent Effects”

Kazumi Sakuramoto
One error was found in the coding of the simulation program for reproducing the recruitment (R) and spawning stock biomass (SSB) of the Pacific stock of the Japanese sardine. As a result of this error, the maturity rate for age 1 in the simulation was found to be half of the value cited from the literature. The aim of this paper is to show the results when the error is corrected. When the error was corrected, the r

Apr 28, 2017Open    AccessArticle

Correction of “Case Study: A Simulation Model of the Spawning Stock Biomass of Pacific Bluefin Tuna and Evaluation of Fisheries”

Kazumi Sakuramoto
One error was found in the coding of the simulation program for reproducing the recruitment (R) and spawning stock biomass (SSB) of Pacific bluefin tuna. As a result of this error, the maturity rates for ages 3 and 4 were found to be much lower in the simulation than the true values. The aim o

Mar 29, 2017Open    AccessArticle

Temperature Tolerance Test Exposition with Temperate Sea Anemone Actinia equina, a Climatic and Environmental Changes Simulation

Juliana Rodrigues Gadelha, Fátima Jesus, Paula Braga Gomes, Jaime Rendón Von Osten, Fernando Morgado, Amadeu Mortágua Velho da Maia Soares
Atlantic and Mediterranean warming-related diseases outbreaks and species shifts recently have been documented. Evaluated tools of short-term effects on the health or organisms resistance are necessary to assess and understand mechanisms affecting marine biodiversity. Until now, climate warming has been studied at the population or community level. Here we offer a better understanding of such phenomena at the individual organism l

Mar 14, 2017Open    AccessArticle

On a Catch-Forecasting Model for the Pink Salmon Oncorhynchus gorbuscha in the Maritime Province of Siberia

Seizo Hasegawa, Naoki Suzuki, Kazumi Sakuramoto
The aim of this paper is to elucidate the fluctuation mechanism in the catch of pink salmon Oncorhynchus gorbuscha harvested in the Maritime Province of Siberia. We used catch data on pink salmon born in odd- and even-numbered years. Monthly indices of the Arctic Oscillation and the Pacific Decadal Oscillation were used as the environmental factors. We assumed t

Jan 13, 2017Open    AccessArticle

Okhotsk Finwhale (Balaenoptera physalus) Modern Distribution and Abundance

Vldimir V. Melnikov, Maksim M. Sidorenko, Sergey V. Fomin
Population of finwhales in north part of Pacific was exposed to excessive commercial pressure and was almost completely eliminated. Information about finwhales in the Sea of Okhotsk after ending is very poor. Observation of whales in the Okhotsk Sea was performed in June, July 2014 and April 2015 from ships travel to a research polygon, carrying out the following records: date, location of ani

Nov 04, 2016Open    AccessArticle

Some Notes on the Regeneration of Coral Reef Ecosystems

Yuri Ya. Latypov
The current research is on fossil and recent coral reef ecosystem by traced processes of recovery after damage of different species. Examples of regeneration of artificially planted fragments of various species of scleractinian and reconstruction of part of the ecosystem of the reef are presented. Particular attention is drawn to the possibility of regeneration after typhoons and anthropogenic impacts.