Aquatic Science and Technology 2022-02-14T02:00:38+00:00 Maggie Liu Open Journal Systems <p><em><strong>Aquatic Science and Technology</strong></em> (ISSN 2168-9148) is a peer-reviewed international scientific and open access journal published by Bigedu Foundation. AST's primary goal is to publish original research papers and review articles dealing with aquatic systems (marine, wetlands, and freshwater systems) and their boundaries. It is published in online version which is free to access and download. The journal accepts <strong><a href="">Online submission</a></strong> and Email submission (<strong></strong>).</p> <p>The scopes of the journal include: Aquaculture, Aquatic Biology, Aquatic Chemistry, Aquatic Ecology, Aquatic Environmental Monitoring, Aquatic Pollution and Remediation, Aquatic Toxicology, Conservation and Utilization of Aquatic Resources, Dynamics of Aquatic Ecosystems, Fisheries Science, Investigation and Assessment</p> Evaluate the Effect of Using Source of Nitrogen (Soaked Brown Lentils) on Chemical Composition for Marine Microalgae Nannochlorpsis oceanica 2021-09-08T01:46:28+00:00 Ali M. Abugrara <p>Microalgae culture media must be efficient, give high growth, meet micro-requirement, and be available. The effect of different levels of brown lentil infusion and use at [25, 50 and 75%] levels on the chemical composition (protein, carbohydrates, fatty acids, and amino acids) in <em>N. oceanic </em>was evaluated. Compared to the standard F/2 Guillard. The obtained results indicated that the chemical components of <em>N. oceanica </em>were affected by these levels. The highest protein and carbohydrate content and the highest EAA content (55.92%) were obtained using OB3 medium (75% SBL) compared to the control group (100% F/2). The highest biomass production was obtained in OB3 medium. The highest TSFA and USFA were recorded for <em>N. oceanica</em> by the OB3 mean.</p> <p>The present study recommended that it is possible to use microalgae grown on OB3 and OB2 medium as a lipid and protein inducer in aquaculture.</p> 2021-09-17T00:00:00+00:00 Copyright (c) 2021 “Notes” Morphology and Histology of the Mysticete’s Prostate and Its Implications in Male Fertility 2021-10-22T02:07:08+00:00 Suárez-Santana C. M. Fernández A. Caballero M. J. Rivero M. A. Arbelo M. <p>The global whale population has dramatically declined in the past centuries due to anthropogenic abuse, whereas, climate change, ship strikes, entanglements, pollution, and water debris are currently making an enormous impact on the recovery of all whales on the planet.</p> <p>The prostate is recognized as the only male accessory gland in odontocete cetaceans, and prostatic pathologies have been recently described as very common in these animals. But nothing is reported about the male accessory gland in any species of mysticete. Here, we describe the topography and histology of the prostate of two baleen whales: a fin whale (<em>Balaenoptera physalus</em>) and a Bryde’s whale (<em>Balaenoptera edeni</em>) and conclude that in the mysticetes, the prostate displays the same general morphologic and histologic characteristics as in odontocetes.</p> <p>The prostatic gland of the mysticete may be a target for many pathogens that wants to spread by a sexual transition to other animals and the offspring which may have great impact on reproductive capability for the individuals.</p> 2021-10-22T00:00:00+00:00 Copyright (c) 2021 Aquatic Science and Technology The Influence of Fertilizer Regimen on Water Chemistry and Filamentous Green Algae in Earthen-Substrate Ponds 2022-02-14T02:00:38+00:00 Matthew J. Ward <p>Water chemistry patterns can be indicative of production potential during pond culture of walleye (<em>Sander vitreus</em>, ≈30 mm total length). However, achieving desired water chemistry patterns that reflect an increase in zooplankton, a reduction in phytoplankton, and a lack of nuisance filamentous green algae in large, earthen-substrate ponds can be challenging. During 2020, water chemistry variables and the occurrence of filamentous green algae were compared in fishless, earthen-substrate ponds (0.72 ha) that received either alfalfa meal (AFM, n=2) or alfalfa meal combined with inorganic nitrogen (AFM+28:0:0, n=2) over an approximate 30-day period. Alfalfa meal use was standard across all ponds (476 kg), while the concentration of inorganic nitrogen (ammonia-N + nitrate-N) was initially raised to 1.25 mg/L with subsequent applications, at three to five-day intervals, having a target concentration of 0.64 mg/L. Initial pH and dissolved oxygen were significantly higher, but pH became significantly lower over time in the AFM+28:0:0 treatment. Ammonia-nitrogen began similarly low (&lt;0.1 mg/L) in both treatments but became and remained significantly higher (peaked 0.44 mg/L on June 9) with 28:0:0 supplementation. Nuisance, filamentous green algae were not observed with 28:0:0 supplementation but were present on the substrate of both ponds in the AFM treatment. Supplementing an alfalfa meal regimen with inorganic nitrogen every three to five days in earthen-substrate ponds deterred filamentous green algae and promoted water chemistry indicative of enhanced walleye fingerling production in previous trials.</p> 2022-02-14T00:00:00+00:00 Copyright (c) 2021 Aquatic Science and Technology