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Fishes, Volume 10, Issue 1 (January 2025) – 2 articles

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14 pages, 1339 KiB  
Article
Effect of Enhanced Antimicrobial Fish Gelatin and Lactic Acid Coating on the Shelf Life of Fresh and Previously Frozen Shrimp
by Hunter Songy, Katheryn Parraga, Wenqing Xu and Evelyn Watts
Fishes 2025, 10(1), 2; https://doi.org/10.3390/fishes10010002 (registering DOI) - 24 Dec 2024
Abstract
Gelatin coatings have been shown to successfully slow the oxidation of fresh foods. Furthermore, organic acids have proven effective in the inhibition of bacteria and the extension of product shelf life. The purpose of this study was to observe the effects of gelatin [...] Read more.
Gelatin coatings have been shown to successfully slow the oxidation of fresh foods. Furthermore, organic acids have proven effective in the inhibition of bacteria and the extension of product shelf life. The purpose of this study was to observe the effects of gelatin and lactic acid treatment combinations on fresh and previously frozen (thawed) wild-caught shrimp. The samples were separated into four treatment groups: control (C), gelatin coating (G), lactic acid followed by gelatin coating (L), and gelatin infused with lactic acid coating (LG). Half of each group was stored at refrigeration temperature (≤4 °C), while the other half was frozen (≤−18 °C) and thawed for the thawed study. Physical, chemical, and microbiological changes were observed in refrigeration storage for 8 days. Results showed that fresh and thawed shrimp exhibited darkening in color over time. Treatments with lactic acid were more blue than yellow. Treated samples developed less oxidation than the control. Psychrophilic counts for samples L and LG remained below the 7 log CFU/g threshold throughout the study. In fresh shrimp samples, the addition of just a gelatin coating was able to increase shelf life by three days, while the addition of lactic acid successfully lowered microbial counts and extended the shelf life by six days. The freeze–thaw cycle negatively affected the extension of shelf life in the G group. Full article
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14 pages, 1963 KiB  
Article
Lipoprotein Biology During Induced Oogenesis in the Shortfinned Eel, Anguilla australis—Vascular Transport
by Erin L. Damsteegt, Benedetta Mercuriali, Georgia Thomson-Laing, Joanna M. Ward and P. Mark Lokman
Fishes 2025, 10(1), 1; https://doi.org/10.3390/fishes10010001 (registering DOI) - 24 Dec 2024
Abstract
The ecological, cultural and economic importance of freshwater eels, coupled with declining wild populations, drives the need for artificial propagation of these fish. Despite the closure of the lifecycle in captivity over a decade ago, numerous bottlenecks still prevent production at a commercially [...] Read more.
The ecological, cultural and economic importance of freshwater eels, coupled with declining wild populations, drives the need for artificial propagation of these fish. Despite the closure of the lifecycle in captivity over a decade ago, numerous bottlenecks still prevent production at a commercially viable scale. Focusing on the key event of nutrient accumulation, we employed hypophysation over a 10-week period with biweekly sampling of female New Zealand shortfinned eels (Anguilla australis). Slotblots, colorimetric lipid/cholesterol assays, fast protein liquid chromatography and radioimmunoassay were used to assess aspects of blood chemistry. The lack of any trend in triglyceride and apolipoprotein B levels in plasma over time, combined with a significant reduction in cholesterol concentrations and a 10-fold increase in vitellogenin levels, confirmed a shift from low-density lipoprotein dominance—usually associated with lipid uptake and early oogenesis—to an abundance of high-density lipoproteins linked to vitellogenesis. The ongoing presence of 11-ketotestosterone in the circulation and the increase in 17β-estradiol levels reinforced the importance of steroids in mediating the gonadotropic signal associated with hypophysation. We conclude that the accumulation of both vitellogenin and apolipoprotein-B-associated lipids is essential for nutrient accumulation in eel oocytes during artificial induction of maturation. Full article
(This article belongs to the Section Physiology and Biochemistry)
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