The potential impacts of low and high salinities on salinity tolerance and condition index of the adult pearl oyster Pinctada imbricata radiata (Leach, 1814)

Abstract The present study was carried out to determine gonadal stages and quality of pearl oyster meat (Pinctada imbricata radiata, Leach, 1814) in Izmir Bay (Turkey). Pearl oyster samples were collected from the study area at a depth of ~5 m between February 2013 and January 2014. The highest and lowest temperature was measured in July and January as 27°C and 14.2°C, respectively. The maximum chlorophyll a value of 4.640 μg l−1 was calculated in May and the lowest value of 1.009 μg l−1 was recorded in April. Individuals reached their first maturity in April. Spawning activity was observed from June to September and the gonad index (GI) was at the highest level during those months. The development was observed from April to February. The overall female to male ratio was 1.32:1 (p < 0.05) and it did not affect the GI (p > 0.05). There is a strong positive correlation between the GI and temperature (p < 0.05). The highest condition index (CI) was recorded in May as 12.31 ± 0.51, whereas the lowest one in January as 7.37 ± 0.22. As a result, this study revealed that the pearl oyster population in the region is characterized by high reproductive activity, especially during the summer months.

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Seasonal variation in the biochemical composition, condition index, and meat yield of the non-indigenous pearl oyster Pinctada imbricata radiata (Leach, 1814) from the West of the Aegean Sea, Greece

Aquaculture and Fisheries ◽

10.1016/j.aaf.2021.09.011 ◽

2021 ◽

Author(s):

John A. Theodorou ◽

Maria Makri ◽

Xanthi Douvi ◽

Alexis Ramfos ◽

Efthimios Spinos

Keyword(s):

Seasonal Variation ◽

Biochemical Composition ◽

Aegean Sea ◽

Condition Index ◽

Pearl Oyster ◽

The West ◽

Meat Yield ◽

Composition Condition ◽

Pinctada Imbricata

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Cubagua’s Pearl-Oyster Beds: The First Depletion of a Natural Resource Caused by Europeans in the American Continent

Journal of Political Ecology ◽

10.2458/v6i1.21423 ◽

1999 ◽

Vol 6 (1) ◽

pp. 57 ◽

Cited By ~ 3

Author(s):

Aldemaro Romero ◽

Susanna Chilbert ◽

M.G. Eisenhart

Keyword(s):

Natural Resources ◽

Natural Resource ◽

Conservation Policy ◽

Pearl Oyster ◽

Biological Conservation ◽

American Continent ◽

First Case ◽

Pearl Oysters ◽

Interdisciplinary Approaches ◽

Pinctada Imbricata

Cubagua’s Pearl-Oyster Beds: The First Depletion of a Natural Resource Caused byEuropeans in the American Continent Interdisciplinary approaches to understanding the causes and mechanisms of depletion of natural resources can provide powerful tools in biological conservation policy. We report here what we believe was the first case of a depletion of a natural resource in the American continent by Europeans: the pearl-oyster (Pinctada imbricata) beds off the coast of Cubagua, Venezuela, in the early sixteenth century.Key words: Pearl-oysters, Depletion, Natural Resources, Overexploitation, HumanRights, Venezuela, Cubagua.

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Spatio-Temporal Variation in Growth Performance and Condition of the Winged Pearl Oyster Pteria penguin

Frontiers in Marine Science ◽

10.3389/fmars.2021.618910 ◽

2021 ◽

Vol 8 ◽

Author(s):

Sophie E. Gordon ◽

Max Wingfield ◽

Patrick F. Smallhorn-West ◽

Siola’a Malimali ◽

Tu’ikologahau Halafihi ◽

...

Keyword(s):

Temporal Variation ◽

Growth Performance ◽

Environmental Conditions ◽

Condition Index ◽

Pearl Oyster ◽

Wave Exposure ◽

Age Cohorts ◽

Pteria Penguin ◽

Spatio Temporal ◽

Southern Island

Environmental conditions can strongly influence the growth performance of pearl oysters and affect pearl farm production schedules. Growth and condition index (CI) of two age cohorts of Pteria penguin were measured for 13 months to investigate differences in growth performance between four culture sites within the northern (Vava’u) and southern (Tongatapu) island groups of the Kingdom of Tonga. Environmental conditions were also measured at culture sites and used to explore potential effects on oyster growth and condition. Between island groups, growth performance of P. penguin was superior at northern sites and was most strongly related to higher water temperatures at these sites. Within the southern island group, growth performance varied significantly between sites and may be driven by differences in wave energy. Monthly growth rates (GM) of P. penguin also showed significant temporal variation related to age and environmental conditions. This study demonstrated significant variation in the growth performance of P. penguin at latitudinal and local scales and suggests that in oligotrophic marine environments with minimal terrestrial inputs, such as Tonga, water temperature and wave exposure may be the primary environmental conditions influencing the growth performance of P. penguin. This study therefore recommends that optimal culture sites for P. penguin in Tonga are characterized primarily by warmer water temperatures (25–30°C) and low wave exposure (<15 joules m2 day–1). Culture of P. penguin at sites with more suitable environmental conditions enables pearl production to begin up to 34.2 % (6.5 months) earlier than at less-suitable sites and this may greatly influence mabé pearl farm profitability and feasibility.

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