|  e-ISSN: 2791-7169

Volume 1 Issue 2 (December 2021)

Issue Information

Full Issue (Volume 1, Issue 2)

pp. i - vi   |  DOI: 10.29329/JofBS.2021.349

Abstract

Keywords:

Original Articles

Influence of different concentrations of ammonium phosphate on nitrogen assimilation of red seaweed Kappaphycus striatus

Albaris Beteh TAHILUDDIN, Euphraim Jayson DICIANO, Rizal Jhunn Falcatan ROBLES, Jainal Potong AKRIM

pp. 39 - 44   |  DOI: 10.29329/JofBS.2021.349.01

Abstract

Eucheumatoid farming is among the most popular source of livelihood for coastal dwellers, especially in the southern Philippines. Kappaphycus and Eucheuma are the two major cultured eucheumatoid species. However, seaweed farmers have been experiencing low seaweed production for the past years. The slow growth of Kappaphycus spp. in the farm is linked to extensive farming, causing nutrient depletion in the seawater. Hence, seaweed farmers in the province of Tawi-Tawi, southern Philippines, enrich their seaweeds, Kappaphycus striatus, with a wide range of inorganic nutrient solution concentrations with an average of nearly 9 g L⁻¹. To provide standard concentration (g L⁻¹) of inorganic nutrient solution for soaking before farming the seaweed, this study investigated nitrogen assimilation using the Kjeldahl method. Treatments were the concentrations of commonly used inorganic fertilizer [ammonium phosphate, (NH4)3PO4] dissolved in filtered seawater namely; T1 = 0 g L⁻¹ as control, T2 = 3 g L⁻¹, T3 = 6 g L⁻¹, and T4 = 9 g L⁻¹. Results showed that the total nitrogen (%) of T4 (0.68±0.01) and T3 (0.59±0.07) were significantly higher (p<0.05) than T2 (0.48±0.02) and T1 (0.46±0.02). This suggests that using inorganic nutrients as enrichment to K. striatus at a concentration of 6 or 9 g L⁻¹ is effective for obtaining high nitrogen assimilation. Therefore, considering the cost-effective inorganic nutrient enrichment practice, this study recommends using 6 g L⁻¹ of inorganic nutrient concentration to help seaweed farmers boost production by improving the growth performance of K. striatus, especially when planted in nutrient-depleted farms. 

Keywords: Ammonium phosphate, Inorganic nutrient enrichment, Kappaphycus striatus, Kjeldahl method, Nitrogen assimilation

Estimating the tree bole volume of Brutian pine (Pinus brutia Ten.) and Taurus cedar (Cedrus libani A. Rich.) using paracone and centriod methods in Turkey

Ramazan ÖZÇELİK, Onur ALKAN

pp. 45 - 48   |  DOI: 10.29329/JofBS.2021.349.02

Abstract

In this study, the most suitable methods for estimating tree bole volume were tested on seventy-six Brutian pine (Pinus brutia Ten.) and fourty-five Taurus cedar (Cedrus libani A. Rich.) trees. The volume of each tree bole was predicted by utilizing Paracone model, Centroid sampling, Huber formula, and local volume table (LVT) for Brutian pine and Taurus cedar. Volume predictions were then evaluated with “true” volume of every tree that was calculated through summing up the volumes of sub-sections (approximately one meter in length) using Smalian’s formula. The mean errors of Paracone model estimation of the tree bole volumes were not significant for both Brutian pine and Taurus cedar and less than those obtained from the Centroid sampling, Huber’s formula, and LVT. When four formulas were compared, the Paracone method valuation was clearly more accurate, and mean error of Paracone method was not significant at 0.05 confidence level.

Keywords: Paracone Model, Centroid sampling, Tree bole volume, Local volume tables

A preliminary study of length-weight relationship (LWR) and condition factor of Pagellus erythrinus from Gökçeada Island, northern Aegean Sea (Turkey)

Semih KALE, Deniz ACARLI, Kamil ÇAKIR

pp. 49 - 57   |  DOI: 10.29329/JofBS.2021.349.03

Abstract

The aim of the present study was to estimate the length-weight relationship and to determine the condition factors of the common pandora (Pagellus erythrinus Linnaeus, 1758) from Gökçeada Island, the northern Aegean Sea in Turkish coasts. Totally 30 specimens of P. erythrinus which are considered as bycatch were sampled by a commercial trawl in the northern Aegean Sea. Total length values of the sampled individuals ranged between 13.60 cm and 18.70 cm in total length and weight values ranged between 28.58 g and 90.04 g. The length-weight relationship of P. erythrinus was estimated as W=0.0062L³.²⁵⁸¹ (R²=0.94). The length-weight relationship was highly significant (p<0.0001). Fulton’s condition factor ranged between 1.08 and 1.56 with a mean of 1.26 (SE: ±0.02). The relative condition factor ranged between 0.86 and 1.26 with a mean of 1.01 (SE: ±0.02). P. erythrinus exhibited a positive allometric growth and the results of Fulton’s condition factor and the relative condition factor indicate the well-being of specimens in the study area. Knowledge of the distribution of exploited stocks is important for the appropriate management of fisheries resources. Therefore, the relationships between the length and weight of fish populations should be investigated and updated regularly. This study provides significant information on the length- weigh relationship and condition factors of P. erythrinus for fisheries managers and policymakers. Responsible authorities should consider the findings of the present study for sustainable fisheries management. 

Keywords: LWR, Trawl, Bycatch, Condition factor, Common pandora

Fractional SVIR model for COVID-19 under Caputo derivative

Nezihal GOKBULUT, David AMILO, Bilgen KAYMAKAMZADE

pp. 58 - 64   |  DOI: 10.29329/JofBS.2021.349.04

Abstract

COVID-19 has been an outbreak since December 2019 all around the world. There exist many studies in literature that examines the future of the pandemic and the effect of control strategies via mathematical modeling. Main aim of mathematical modeling in epidemiology and health sciences is applying the theory to real world health problems. In this paper, world population is divided into four compartments for the construction of SVIR model. That is, it is assumed that population consists of susceptible (S), vaccinated (V), infected (I), and recovered (R) individuals. Fractional mathematical models are very popular nowadays since it counts previous state of problems. While the construction of this model, fractional derivative is added with the purpose of seeing memory effect.

Keywords: Mathematical modelling, Fractional Caputo derivative, COVID-19, Vaccination

First record of Mauremys rivulata (Valenciennes, 1833) from Atikhisar Reservoir (Çanakkale, Turkey)

Semih KALE, Selçuk BERBER, Deniz ACARLI

pp. 65 - 71   |  DOI: 10.29329/JofBS.2021.349.05

Abstract

This study firstly reported the presence of Mauremys rivulata in the Atikhisar Reservoir in Çanakkale, Turkey. M. rivulata was observed during the sampling of freshwater crayfish in the reservoir between 4-5 m water depth on September 27, 2021. A single individual was caught with a fyke-net having 17 mm mesh size. The straight carapace length and straight carapace width of the individual were measured to be 20.52 and 12.95 cm, respectively. Knowing the distribution of a species enables researchers to better understand the ecological biology and is of great importance for researchers to study certain aspects such as population dynamics, migration, reproduction, feeding, habitat preferences, etc. Therefore, this paper provides valuable information for fisheries managers, policymakers and scientists involved in the aquatic species.

Keywords: First report, Mauremys rivulata, Balkan pond turtle, Western Caspian turtle, Presence