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Jan 16, 2023Open    Access

Does the Density-Dependent Growth of Sardine Truly Exist?

Kazumi Sakuramoto
This paper reviews two studies discussing density-dependent growth using Japanese sardine data. However, the results and interpretation of these two papers indicate inconsistencies and conflict with each other. This study shows that the length of sardines in year t can be explained by the values of the three-year moving average of reproductive success in year t - 3. This indicates that the existing density-dependent growth of sardines is questionable and that environmental conditions determine t...
Open Access Library J.   Vol.10, 2023
Doi:10.4236/oalib.1109514


Jan 11, 2022Open    Access

Erratum to “Reproductive Success in Fish Stocks Can Be Reproduced by Environmental Factors Alone” [Open Access Library Journal, 2021, Volume 8: e7636]

Kazumi Sakuramoto
The original online version of this article (Sakuramoto, K. (2021) Reproductive Success in Fish Stocks Can Be Reproduced by Environmental Factors Alone. Open Access Library Journal, 8: e7636. https://doi.org/10.4236/oalib.1107636) unfortunately contains some mistakes. The author wishes to correct the errors in the following version:
Open Access Library J.   Vol.9, 2022
Doi:10.4236/oalib.1108231


Dec 22, 2021Open    Access

A Model that Forecasts Future Values of Reproductive Success for the Pacific Stock of Splendid Alfonsino

Kazumi Sakuramoto
A model that forecasts future values of the reproductive success (RPS) for the Pacific stock of Splendid alfonsino (Beryx splendens) using environmental factors is described. The monthly Arctic oscillation index and Pacific decadal oscillation were used as the environmental factors. The RPS from 1999 to 2019 was reproduced and that from 2020 to 2024 was forecasted. The results were as follows: The fitness between the observed and reproduced RPS coincided well. The average RPS from 1999 to 2019 w...
Open Access Library J.   Vol.8, 2021
Doi:10.4236/oalib.1108213


Jul 23, 2021Open    Access

Reproductive Success in Fish Stocks Can Be Reproduced by Environmental Factors Alone

Kazumi Sakuramoto
This study showed that reproductive successes (RPS) in fish stocks could be reproduced using only environmental factors. As the environmental factors, the monthly Arctic oscillation index and Pacific decadal oscillation were used. The RPS of 12 stocks harvested around Japan were reproduced. The results were as follows: the fitness between observed and reproduced RPS, and the number of the independent variables necessary for reproducing the RPS differed by stock. However, the fluctuations of RPS ...
Open Access Library J.   Vol.8, 2021
Doi:10.4236/oalib.1107636


Mar 16, 2021Open    Access

Further Analysis of 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 that explains why the loops emerge in SRR has been proposed, and the aim of this study was to validate this mechanism using 62 stocks that live in the waters around Japan, the Northwest Atlantic Fisheries Organization area, and elsewhere. We discuss the relationship between the age at maturity and the slope of the regression line adapted for the SRR data. Further, we discuss whether or not the...
Open Access Library J.   Vol.8, 2021
Doi:10.4236/oalib.1107164


Jan 16, 2020Open    Access

Fish Pond Effluent Effect on Physicochemical Properties of Soils in Southern Guinea Savanna, Nigeria

John Jiya Musa, Pius Olusegun Olufemi Dada, Johnson Kayode Adewumi, Otuaro Ebierni Akpoebidimiyen, Elijah Tsado Musa, Martins Yusuf Otache, Seun Yusuf
This work studied the effect of fish pond wastewater, proximate and mineral analyses of the fish feeds from commercial fish ponds on receiving soils in the southern Guinea Savanna ecological zone of Minna, Nigeria. The study con-ducted during the dry seasons of the years 2015 and 2016 between January and May. Four sets of soil samples were collected at varying distances from the various fish ponds an
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Open Access Library J.   Vol.7, 2020
Doi:10.4236/oalib.1105990


May 20, 2019Open    Access

Observation of Humpback Whales (Megaptera novaeangliae) in the Waters Adjacent to the Chukotka Peninsula with Comparisons to Historical Sighting Data

Vladimir V. Melnikov
This paper presents data from shore-based and limited boat observations of the seasonal distributions of humpback whales in waters adjacent to the Chukotka Peninsula from 1994 and 2012. Under favourable ice conditions, humpback whales were spotted off the coast of the Chukotka Peninsula as early as the end of May. During the summer, humpback whales remained dispersed in the coastal waters of t
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Open Access Library J.   Vol.6, 2019
Doi:10.4236/oalib.1105407


Mar 15, 2018Open    Access

Detection of Horizontal Transfer of Housekeeping and Hydrocarbons Catabolism Genes in Bacterial Genus with Potential to Application in Bioremediation Process

Edmo Montes Rodrigues, Fernanda de Souza Freitas, Tatiane de Paula Siqueira
In silico analysis can be useful to infer about the horizontal gene transfer (HGT) as well as to deduce about the evolutionary relations of catabolic genes. In this study, we performed the analysis of two housekeeping genes (fabD and rpoD) and two catabolic gene
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Open Access Library J.   Vol.5, 2018
Doi:10.4236/oalib.1104454


Mar 05, 2018Open    Access

Epiphytic Bacterial Communities in Seagrass Meadows of Oligotrophic Waters of Andaman Sea

Amrit Kumar Mishra, Raju Mohanraju
The epiphytic microbial communities of seagrass (Cymodocea rotundata and Thalassia testudinum) along with sediments and seawater of the seagrass ecosystem of Andaman
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Open Access Library J.   Vol.5, 2018
Doi:10.4236/oalib.1104388


Feb 28, 2018Open    Access

The True Mechanism That Controls the Stock-Recruitment Relationship

Kazumi Sakuramoto
I propose a mechanism that controls the stock-recruitment relationship (SRR), which should replace traditional SRR models. The difference between the traditional SRR models and the model proposed herein is whether or not a density-dependent effect is assumed. The new mechanism elucidates the following: 1) why clockwise loops or anticlockwise loops are commonly observed in an actual SRR, and 2) the age at maturity (not a density-de
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Open Access Library J.   Vol.5, 2018
Doi:10.4236/oalib.1104341


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