Annual Research & Review in Biology https://journalarrb.com/index.php/ARRB <p style="text-align: justify;">The aim of <strong>Annual Research &amp; Review in Biology (ARRB)</strong> <strong>(ISSN: 2347-565X)</strong> <strong>(Previous name:</strong> <strong>Annual Review &amp; Research in Biology, ISSN: 2231-4776</strong>) is to publish high quality papers (<a href="/index.php/ARRB/general-guideline-for-authors">Click here for Types of paper</a>) with broad areas of Aerobiology, &nbsp;Agriculture, Anatomy, Astrobiology, Biochemistry, Bioengineering, Bioinformatics, Biomathematics or Mathematical Biology, Biomechanics, Biomedical research, Biophysics, Biotechnology, Building biology, Botany, Cell biology, Conservation Biology, Cryobiology, Developmental biology, Food biology, Ecology, Embryology, Entomology, Environmental Biology, Epidemiology, Ethology, Evolutionary Biology, Genetics, Herpetology, Histology, Ichthyology, Integrative biology, Limnology,&nbsp; Mammalogy, Marine Biology, Microbiology, Molecular Biology, Mycology, Neurobiology, Oceanography, Oncology, Ornithology, Population biology, Population ecology, Population genetics, Paleontology, Pathobiology or pathology, Parasitology, Pharmacology, Physiology, Psychobiology, Sociobiology, Structural biology, Virology and&nbsp; Zoology. This is a quality controlled, peer-reviewed, open access INTERNATIONAL journal.</p> SCIENCEDOMAIN international en-US Annual Research & Review in Biology 2347-565X Reproductive Biology of Marine Catfish, Arius latiscutatus (Günther, 1864) and Arius gigas (Boulenger, 1911) from the Bays of Guinea https://journalarrb.com/index.php/ARRB/article/view/30254 <p><strong>Background and Objectives:</strong> Marine catfish are abundant in the bays of Tabounsou and Sangareah in Republic of Guinea, but the knowledge on their biology is still scanty. The reproductive biology of&nbsp;<em>Arius latiscutatus </em>Günther, 1864 and&nbsp;<em>A. gigas </em>Boulenger, 1911 was studied through monthly sampling, from January to December 2016.</p> <p><strong>Methodology:</strong> Fish were caught using gill nets in several sampling sites. Five gonadal stages were described, based on macroscopic observation of gonad form, size, weight, color and oocyte diameter.</p> <p><strong>Results: </strong>The population was dominated by males (61%) in <em>A. latiscutatus</em> and females (53%) in A. gigas, showing a sex-ratio of 1:1.54 (Chi-square, <em>P </em>&lt; 0.05) and 1:0.88 (<em>P </em>&gt; 0.05), respectively. The length-weight relationship was a positive allometry for <em>A. latiscutatus and A. gigas</em>, and males (35.37 and 35.47 cm, respectively) reached first maturity earlier than females (39.7 and 40.8 cm, respectively). Changes in the gonadosomatic index (GSI) and in stages of gonadal development showed that&nbsp;<em>A. latiscutatus&nbsp;</em>spawned between April and October, while&nbsp;<em>A. gigas&nbsp;</em>spawned in May to November. The peak of condition factor was observed in June (0.68±0.05) and July (0.55±0.04) in females of <em>A. latiscutatus</em> and <em>A. gigas</em>, respectively.</p> <p><strong>Conclusion: </strong>Both species, having only one annual breeding season, <em>A. latiscutatus</em> spawns earlier than <em>A. gigas</em>. Coastal fisheries should be restricted in cold season to preserve the ability of broodstock renewal for these species.</p> Pierre Koivogui Yao Aristide Konan Bakari Coulibaly Essetchi Paul Kouamelan Tidiani Koné ##submission.copyrightStatement## 2020-08-05 2020-08-05 1 13 10.9734/arrb/2020/v35i830254 About the Influences of Some Major Biotic Drivers on the Population Dynamics in Host-parasite Systems: Interpretative Lessons from an Extended Nicholson-Bailey Model https://journalarrb.com/index.php/ARRB/article/view/30256 <p>Population dynamics within host-parasite systems in insects is governed by a series of factors, both endogenous and exogenous. Among them, five factors may be considered as major drivers: the respective inherent rates of increase of the host and of the parasite, the level of resource available to the host, the respective immigration rates of the host and of the parasite. While only the first two (the inherent rates of increase of host and parasite) are considered in the original Nicholson and Bailey model, an extended version of the model includes also the other three parameters, thus providing a broader (although still schematic) approach to the host-parasite population dynamics. A brief analysis of the respective influences of each of these five driving parameters on the main features of host-parasite dynamics is derived accordingly, based upon this extended model. Finally, specific attention is paid to the major concerns due to the cyclic outbreaks of both the host and the parasite, regarding in particular the amplitude, the periodicity and the conditions of onset of the cyclicity. Both the practical aspects of the cyclic regime and its possible adaptative significance are discussed. As a whole, this approach aims to provide some general clues for the interpretation of various features of the host-parasite dynamics, as reported from field observations.</p> Jean Béguinot ##submission.copyrightStatement## 2020-08-05 2020-08-05 14 32 10.9734/arrb/2020/v35i830256