Abstract Chemical dispersants are an important technology in the remediation of oil spills aquatic environment, facilitating degradation crude and salinity is factor dispersant effectiveness. The aim present study was to explore role on chemistry polycyclic aromatic hydrocarbons (PAHs) acute toxicity water‐accommodated fraction (WAF) COREXIT 9500A chemically dispersed a common estuarine fish. Laboratory microcosms were designed at salinities 4 parts per thousand (ppt), 12 ppt, or 18 ppt...

Abstract Hardhead catfish Ariopsis felis are a common marine in the coastal waters of Gulf Mexico (GOM). The low economic value this species has depressed interest and research, although is known for its extremely fecundity large oocytes, little else about species. A total 1230 samples across all months year from 2016 to 2018 resulted 681 females, analysis gonado‐somatic index ( I G ) revealed 1% be clear cut‐off indicating maturity. Females considered capable spawning April June when...

Freshwater and marine fishes exhibit a dichotomy in biosynthesis of long-chain polyunsaturated fatty acids (LC-PUFAs) from shorter-chain precursors. Marine species generally lack this ability due to deficiencies requisite desaturase or elongase enzymes. Gulf killifish Fundulus grandis is euryhaline cyprinodont whose acid (FA) dynamics have not been previously examined. We utilized experimental variations exogenous FAs available spawning F. order construct multitissue evaluation FA allocation...

Successful culture of Gulf killifish Fundulus grandis as a live marine baitfish in the south-eastern United States has experienced low fecundity primary restriction. Hence, ability to optimize reproduction captive populations may increase potential for viable large-scale production. Broodfish nutrition is an expanding field aquaculture, and improved nutritional status been shown reproductive output some cultured fish. This study examined changes quantitative inclusion lipid fish oil complete...

Channel catfish, Ictalurus punctatus , pituitary powder (CP) was prepared and administered to determine the effect of preparation, head selection criteria, season collection on biological potency this gonadotropic preparation. Pituitaries were harvested from three catfish processing plants throughout months December, February, March, April investigate CP potency. Gravid female channel injected intraperitoneally (IP) with priming (2 mg/kg) resolving doses (8 treatments, luteinizing...

Abstract Soybean meal, the major protein source used in commercial feeds for channel catfish Ictalurus punctatus, contains natural phytoestrogens known as isoflavones, many of which have been found to be endocrine disruptors. This study investigated whether genistein (an isoflavone) a soybean-based diet would increase plasma vitellogenin (Vtg) concentrations and it compete with estradiol (E2) binding sites on adult hepatic estrogen receptors (ERs). Three-year-old males females were fed...

We evaluated the accuracy of an Accutrend® lactate meter and a Reichert® Vet 360 temperature compensated refractometer for determining red swamp crayfish Procambarus clarkii (Girard, 1852) hemolymph protein concentrations, with results compared to measurements obtained from spectrophotometric analyses. Results (R2=0.926) (R2=0.830) both demonstrated strong relationships spectrophotometer measurements, indicating that these instruments provide rapid, reliable, economical methods...

Abstract Alligator Gars Atractosteus spatula are being cultured to restore populations in areas of their historical occurrence or abundance. This phylogenetically ancient species can be long‐lived and reach a large body size. Broodfish development has been considered an obstacle for aquaculture because the species’ advanced age at maturity unpredictable volitional spawning, requiring animals injected with spawning‐inducing hormones. focus collaborative conservation program involving...

Abstract Pinfish Lagodon rhomboides and Pigfish Orthopristis chrysoptera are commonly used as marine baitfish in the southeastern United States. Hormone efficacy studies for spawning induction have been conducted with both species, but aids derived from piscine pituitary extracts yet to be evaluated. Pituitary extract Channel Catfish Ictalurus punctatus (CCPE) was chosen determine its on induction. The CCPE dissolved a saline solution then injected into female broodfish at 5, 10, 20, or 40...

Gulf Killifish Fundulus grandis is one of the largest killifish species. It a euryhaline teleost and popular baitfish occurring along coastal Mexico southern Atlantic states. There currently limited information on grow-out characteristics in indoor recirculating aquaculture systems (RAS). This preliminary study aims at determining effects stocking density growth survival juvenile RAS. Individuals 0.45 ± 0.01 g (mean SE) weight were stocked initial densities 2 5 fish/L 60-L tanks RAS with...

Abstract Commercial interest in production of F1 hybrids female channel catfish Ictalurus punctatus × male blue I. furcatus has increased dramatically. However, current methods are unable to provide large numbers hybrid fingerlings for commercial producers. Increasing the hatch rates embryos will aid making large-scale a feasible option industry. The objectives this study were determine (1) whether electrical stimulation excised testes Rio Grande and D&B strain (Kincaid et al. 2000)...

Abstract The economically viable large-scale production of the pure isoforms surfactin biosurfactants, involving bacterial – Bacillus subtilis fermentation biomass hydrolysate feedstock, relies on types strains, optimization processing parameters, differences in composition carbon and nitrogen media, chromatography techniques used for isolation isoforms. Here, we biosynthesized their mixture forms through hydrolysates at 2 wt.% carbohydrate content. were assessed surface-active properties...

Management and conservation have begun to rely on supplemental information make appropriate decisions. In organisms with little available information, preserved specimens may be particularly important for researchers continue their role in the management process. Bluenose Shiners are a minnow species that can benefit from such analyses as they of concern across native range Southeastern United States. To supplement conservation, objectives were to: (a) quantify sexual dimorphism through...

Abstract A culture demand has developed within the ornamental and baitfish industries for fishes of genus Fundulus . Refining reproductive methods may not only benefit important industries, but related species conservation concern as well. Golden Topminnows chrysotus are a common fish across their native range they have own demand. Low fecundity observed in been main obstacle to efficient culture. Therefore, objective this study was determine optimal female broodfish size increasing certain...