A Reproductive Histological Analysis of Rangia cuneata (Venerida: Mactridae): Effects of Abiotic Factors

2019 ◽  
Vol 37 (1) ◽  
pp. 12
Author(s):  
Brandon D. Drescher ◽  
Nancy J. Brown-Peterson ◽  
Jennifer M. Walker
Keyword(s):  
Histological Analysis ◽  
Abiotic Factors ◽  
Rangia Cuneata

scholarly journals Physiological status for fingerlings of kaluga and reciprocal hybrid sterlet x kaluga in the wintering period

2015 ◽  
Vol 182 (3) ◽  
pp. 226-241
Author(s):  
Vera N. Valova
Keyword(s):  
Histological Analysis ◽  
Wide Spectrum ◽  
Abiotic Factors ◽  
Comparative Characteristic ◽  
Physiological Status ◽  
Reciprocal Hybrid ◽  
Herpesvirus Infection ◽  
Prophylactic Measures ◽  
Viral Nature ◽  
In The Beginning

Wintering is one of the most complicated biotechnical processes in pisciculture, and its success depends on a wide spectrum of biotic and abiotic factors, first of all on the fish physiological status before this period. Sturgeon fishes are believed to stop feeding under the water temperature below 4 °C that causes essential reorganization of their metabolism because of transition to endogenous feeding. Physiological status of fingerlings of kaluga and reciprocal hybrid sterlet x kaluga is compared in the beginning, middle and end of wintering, with comparative characteristic of their peripheral blood reaction and understanding of starvation influence on their digestive and hemopoietic systems. The fingerlings of both species were kept in cages of warm-water farm and fed with fodder. The fingerlings of kaluga started the wintering with improper physiological status, with evident pathological processes expressed as eosinophilia, macrocytic hyperchromic anaemia, increase of immature erythrocytes, and pathomorphological changes of erythrocytes (poikilocytosis, anisocytosis, karyorhexis, hemolysis). These symptoms could be caused by either herpesvirus infection or cumulative polytoxicosis, but results of hematological and histological analysis in the middle and end of the wintering confirmed the viral nature. Thus, mass disease and mortality of fish is possible in conditions of the temperature increase in spring. Therefore, prophylactic measures are recommended for overwintered kaluga fingerlings to enhance their immune and physiological status, such as addition of vitamins C and E, probiotics and prebiotics to fodder. On the contrary, the fingerlings of reciprocal hybrid sterlet x kaluga had a high physiological status before and during wintering, in spite of a rather high portion of eosinophiles in their leukogram.

scholarly journals Mortality of post-settlement clams Rangia cuneata (Mactridae, Bivalvia) at an early stage of invasion in the Vistula Lagoon (South Baltic) due to biotic and abiotic factors

Hydrobiologia ◽  
2018 ◽  
Vol 811 (1) ◽  
pp. 207-219 ◽  
Author(s):  
Ryszard Kornijów ◽  
Krzysztof Pawlikowski ◽  
Aleksander Drgas ◽  
Leszek Rolbiecki ◽  
Agata Rychter
Keyword(s):  
Early Stage ◽  
Abiotic Factors ◽  
Vistula Lagoon ◽  
Biotic And Abiotic Factors ◽  
Rangia Cuneata ◽  
The Vistula Lagoon

Clinical and Histological Analysis of Oral Mucocele

2013 ◽  
Vol 56 (6) ◽  
pp. 359 ◽  
Author(s):  
Seung-Gu Park ◽  
No-Seon Park ◽  
Chin-Saeng Cho ◽  
Ah-Young Kim ◽  
Dong-Sik Chang ◽  
...  
Keyword(s):  
Histological Analysis

Coral husbandry for ocean futures: leveraging abiotic factors to increase survivorship, growth, and resilience in juvenile Montipora capitata

2021 ◽  
Vol 657 ◽  
pp. 123-133
Author(s):  
JR Hancock ◽  
AR Barrows ◽  
TC Roome ◽  
AS Huffmyer ◽  
SB Matsuda ◽  
...  
Keyword(s):  
Abiotic Factors ◽  
Larval Rearing ◽  
Abiotic Conditions ◽  
Montipora Capitata ◽  
Reef Restoration ◽  
Juvenile Corals ◽  
Bleaching Response ◽  
The Face ◽  
Survival And Growth ◽  
Global And Local

Reef restoration via direct outplanting of sexually propagated juvenile corals is a key strategy in preserving coral reef ecosystem function in the face of global and local stressors (e.g. ocean warming). To advance our capacity to scale and maximize the efficiency of restoration initiatives, we examined how abiotic conditions (i.e. larval rearing temperature, substrate condition, light intensity, and flow rate) interact to enhance post-settlement survival and growth of sexually propagated juvenile Montipora capitata. Larvae were reared at 3 temperatures (high: 28.9°C, ambient: 27.2°C, low: 24.5°C) for 72 h during larval development, and were subsequently settled on aragonite plugs conditioned in seawater (1 or 10 wk) and raised in different light and flow regimes. These juvenile corals underwent a natural bleaching event in Kāne‘ohe Bay, O‘ahu, Hawai‘i (USA), in summer 2019, allowing us to opportunistically measure bleaching response in addition to survivorship and growth. This study demonstrates how leveraging light and flow can increase the survivorship and growth of juvenile M. capitata. In contrast, larval preconditioning and substrate conditioning had little overall effect on survivorship, growth, or bleaching response. Importantly, there was no optimal combination of abiotic conditions that maximized survival and growth in addition to bleaching tolerances. This study highlights the ability to tailor sexual reproduction for specific restoration goals by addressing knowledge gaps and incorporating practices that could improve resilience in propagated stocks.

Characterizing the impact of recovering sea otters on commercially important crabs in California estuaries

2020 ◽  
Vol 655 ◽  
pp. 123-137
Author(s):  
TM Grimes ◽  
MT Tinker ◽  
BB Hughes ◽  
KE Boyer ◽  
L Needles ◽  
...  
Keyword(s):  
Abiotic Factors ◽  
Sea Otter ◽  
Dungeness Crab ◽  
Sea Otters ◽  
Elkhorn Slough ◽  
Enhydra Lutris Nereis ◽  
Crab Abundance ◽  
Population Sizes ◽  
Commercially Important ◽  
The Impact

Protective legislation and management have led to an increase in California’s sea otter Enhydra lutris nereis population. While sea otter recovery has been linked to ecosystem benefits, sea otter predation may negatively affect commercially valuable species. Understanding the potential influence of sea otters is of particular importance as their range expands into estuaries that function as nurseries for commercially valuable species like Dungeness crab Metacarcinus magister. We consider how sea otter predation has affected the abundance and size of juvenile Dungeness crab in Elkhorn Slough, California, USA, and analyzed cancrid crab abundance and size across 4 California estuaries with and without sea otters to understand how biotic and abiotic factors contribute to observed variation in crab size and abundance. We compared trends in southern sea otters relative to Dungeness crab landings in California to assess whether increasing sea otter abundance have negatively impacted landings. In Elkhorn Slough, juvenile Dungeness crab abundance and size have declined since 2012, coinciding with sea otter population growth. However, the impact of sea otters on juvenile Dungeness crab size was habitat-specific and only significant in unvegetated habitat. Across estuaries, we found that cancrid crab abundance and size were negatively associated with sea otter presence. While abiotic factors varied among estuaries, these factors explained little of the observed variation in crab abundance or size. Although we found evidence that sea otters can have localized effects on cancrid crab populations within estuaries, we found no evidence that southern sea otters, at recent population sizes, have negatively impacted Dungeness crab landings in California from 2000-2014.

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