scholarly journals Testing a Model of Pacific Oysters’ (Crassostrea gigas) Growth in the Adriatic Sea: Implications for Aquaculture Spatial Planning

2021 ◽  
Vol 13 (6) ◽  
pp. 3309
Author(s):  
Camilla Bertolini ◽  
Daniele Brigolin ◽  
Erika M. D. Porporato ◽  
Jasmine Hattab ◽  
Roberto Pastres ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Crassostrea Gigas ◽  
Adriatic Sea ◽  
Temperature Limit ◽  
Potential Productivity ◽  
Northern Adriatic ◽  
Pacific Oysters ◽  
Summer Temperatures ◽  
Productivity Indicators ◽  
Marketable Size

Assessing the potential biomass yield is a key step in aquaculture site selection. This is challenging, especially for shellfish, as the growth rate depends on both trophic status and water temperature. Individual ecophysiological models can be used for mapping potential shellfish growth in coastal areas, using as input spatial time series of remotely sensed SST and chlorophyll-a. This approach was taken here to estimate the potential for developing oyster (Crassostrea gigas) farming in the western Adriatic Sea. Industry relevant indicators (i.e., shell length, total individual weight) and days required to reach marketable size were mapped using a dynamic energy budget model, finetuned on the basis of site-specific morphometric data collected monthly for a year. Spatially scaled-up results showed that the faster and more uniform growth in the northern Adriatic coastal area, compared with the southern one, where chlorophyll-a levels are lower and summer temperatures exceed the critical temperature limit for longer periods. These results could be used in planning the identification of allocated zones for aquaculture, (AZA), taking into account also the potential for farming or co-farming C. gigas. In perspective, the methodology could be used for getting insights on changes to the potential productivity indicators due to climatic changes.

scholarly journals Reproductive cycle of a non-native oyster, Crassostrea gigas, in the Adriatic Sea

2020 ◽  
Vol 21 (1) ◽  
pp. 146 ◽  
Author(s):  
DARIA EZGETA BALIĆ ◽  
IVANA RADONIĆ ◽  
DUBRAVKA BOJANIĆ VAREZIĆ ◽  
BARBARA ZORICA ◽  
JASNA ARAPOV ◽  
...  
Keyword(s):  
Reproductive Biology ◽  
Reproductive Cycle ◽  
Environmental Conditions ◽  
Crassostrea Gigas ◽  
Adriatic Sea ◽  
Pacific Oyster ◽  
Indigenous Species ◽  
Natural Habitats ◽  
Northern Adriatic ◽  
The Pacific

The Pacific oyster Crassostrea gigas was introduced for the aquaculture purposes in many different parts of the world. However, the species has never been officially introduced for commercial farming in the Croatian part of the Adriatic Sea. Interestingly, in the 1970s, the Pacific oyster has been reported in the natural habitats of the Lim Bay, in northern Adriatic Sea. Although the species was recorded there, there is a lack of knowledge about its biology and ecology in this region, including a reproductive cycle. Information on the reproductive biology of non-indigenous species in new areas is crucial for prediction of their future survival and possible spread in invaded habitats. In this study, we provide the first data on the reproductive biology of the Pacific oyster in the Adriatic Sea, the northernmost part of the Mediterranean Sea. Quantitative and qualitative methods of gonad tissue analysis were conducted, and effects of environmental conditions on the gametogenesis were evaluated during two reproductive cycles. Our study confirmed that environmental conditions in the Lim Bay were favourable for the reproduction of the species. The Pacific oyster reproduced once per year and had a prolonged spawning period. Water temperature was the main factor affecting gonad development and oocyte size, while chlorophyll a concentration had an impact on the oocyte development in terms of their size.  

scholarly journals Relationships between surface-active organic substances, chlorophyll a and nutrients in the northern Adriatic Sea

2011 ◽  
Vol 31 (10) ◽  
pp. 1149-1160 ◽  
Author(s):  
Blaženka Gašparović ◽  
Tamara Djakovac ◽  
Nataša Tepić ◽  
Danilo Degobbis
Keyword(s):  
Chlorophyll A ◽  
Adriatic Sea ◽  
Organic Substances ◽  
Northern Adriatic Sea ◽  
Northern Adriatic ◽  
Surface Active

scholarly journals Phytoplankton–Macrophyte Interaction in the Lagoon of Venice (Northern Adriatic Sea, Italy)

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2810
Author(s):  
Fabrizio Bernardi Aubry ◽  
Francesco Acri ◽  
Gian Marco Scarpa ◽  
Federica Braga
Keyword(s):  
Chlorophyll A ◽  
Adriatic Sea ◽  
Lagoon Of Venice ◽  
Remotely Sensed Data ◽  
Northern Adriatic Sea ◽  
Ecosystem Research ◽  
Northern Adriatic ◽  
In Situ Data ◽  
First Time

The coexistence of phytoplankton and macrophytes in the Lagoon of Venice (Northern Adriatic Sea, Italy) was investigated using in situ data collected monthly as part of International Long Term Ecosystem Research (LTER), together with satellite imagery for the period 1998–2017. The concentrations of chlorophyll a and hydrochemical parameters were measured in three areas of the lagoon, where the expansion of well-developed stands of submerged vegetation was observed by remote sensing. Our results suggest interaction between phytoplankton and macrophytes (macroalgae and seagrasses) in the last few years of the time series, evidenced by decreasing chlorophyll a concentrations in the vicinity of the macrophyte stands. The integration of LTER and remotely sensed data made it possible to evaluate the interaction of macrophytes and phytoplankton at the ecosystem scale for the first time in the Lagoon of Venice.

scholarly journals Electrophysiological Evaluation of Pacific Oyster (Crassostrea gigas) Sensitivity to Saxitoxin and Tetrodotoxin

Marine Drugs ◽  
2021 ◽  
Vol 19 (7) ◽  
pp. 380
Author(s):  
Floriane Boullot ◽  
Caroline Fabioux ◽  
Hélène Hégaret ◽  
Pierre Boudry ◽  
Philippe Soudant ◽  
...  
Keyword(s):  
Crassostrea Gigas ◽  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Alexandrium Minutum ◽  
Paralytic Shellfish Toxins ◽  
Pacific Oysters ◽  
Paralytic Shellfish ◽  
Good Potential ◽  
First Time ◽  
Micromolar Range

Pacific oysters (Crassostrea gigas) may bio-accumulate high levels of paralytic shellfish toxins (PST) during harmful algal blooms of the genus Alexandrium. These blooms regularly occur in coastal waters, affecting oyster health and marketability. The aim of our study was to analyse the PST-sensitivity of nerves of Pacific oysters in relation with toxin bio-accumulation. The results show that C. gigas nerves have micromolar range of saxitoxin (STX) sensitivity, thus providing intermediate STX sensitivity compared to other bivalve species. However, theses nerves were much less sensitive to tetrodotoxin. The STX-sensitivity of compound nerve action potential (CNAP) recorded from oysters experimentally fed with Alexandrium minutum (toxic-alga-exposed oysters), or Tisochrysis lutea, a non-toxic microalga (control oysters), revealed that oysters could be separated into STX-resistant and STX-sensitive categories, regardless of the diet. Moreover, the percentage of toxin-sensitive nerves was lower, and the STX concentration necessary to inhibit 50% of CNAP higher, in recently toxic-alga-exposed oysters than in control bivalves. However, no obvious correlation was observed between nerve sensitivity to STX and the STX content in oyster digestive glands. None of the nerves isolated from wild and farmed oysters was detected to be sensitive to tetrodotoxin. In conclusion, this study highlights the good potential of cerebrovisceral nerves of Pacific oysters for electrophysiological and pharmacological studies. In addition, this study shows, for the first time, that C. gigas nerves have micromolar range of STX sensitivity. The STX sensitivity decreases, at least temporary, upon recent oyster exposure to dinoflagellates producing PST under natural, but not experimental environment.

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