Evidencia de diferenciación sexual en la almeja &lt;i&gt;Ameghinomya antiqua&lt;/i&gt; de la costa chilena y su proporción de sexos

Prida, Valentina; Valenzuela, Andrea; Astorga, Marcela

doi:10.22370/rbmo.2018.53.3.1361

Cited by 4 publications

(7 citation statements)

References 8 publications

(9 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The females presented a milky texture and a whitish colour, while the males presented a more granular and beige gonad. This slight difference in coloration is like the one recently described for the Ameghinomya antiqua clam (Prida et al, 2018), where the females presented a whitish gonad and the males more orange gonads. The embryonic and early larval development of Tawera elliptica follows the pattern described for bivalve molluscs, with the stages of the first, second and third division, morula, blastula, gastrula, trochophore larva and type D veliger larva (Contreras et al, 2014; da Costa et al, 2008; Gros et al, 1997, 1999; Raleigh & Keegan, 2007).…”

Section: Discussionsupporting

confidence: 86%

See 1 more Smart Citation

Broodstock conditioning, spawning, embryonic and early larval development of a novel baby clam species for aquaculture in the southeast Pacific: Tawera elliptica (Lamarck, 1818)

Barría

Abarca

Colivoro

et al. 2021

Aquaculture Research

View full text Add to dashboard Cite

Tawera elliptica is a small size (baby) clam with an export fishery in southern Chile. The species is dioecious with external fertilization and without sexual dimorphism. The aim of this work was to optimize broodstock conditioning, induce spawning and describe embryonic development until the early larval stage in a hatchery. Broodstock were conditioned at 3 treatments (with/without sand; water circulation) for 48 days. The clams were fed with a mixed diet of macroalgae, with a daily ration of 250,000 cells/ml. Broodstock response was quantified using condition index and gonad development stages (histological techniques). For spawning induction, physical and biological methods were tested. The best response was achieved in males with physical induction. Histological analysis showed that the water circulation system treatment exhibited the highest percentage of maximum maturity. A fertilization ratio of 500:1 sperm:oocyte was used. The incubation was carried out in 3‐L containers with filtered seawater at 10.7 ± 0.9°C without aeration. Observations, measurements and the duration of each embryonic and larval stage were recorded. The oocyte has a prominent gelatinous layer (= jelly coat) that disappears between the gastrula and trochophore stages. The status of the D‐larval stage was reached at 107 h post fertilization with a mean valve length of 91.4 ± 8.9 µm. This is the first record of the complete embryonic development of this baby clam until the early larval stage and the conditioning in a water circulation system for 48 days are suitable for the species.

show abstract

Section: Discussionsupporting

confidence: 86%

Section: F I G U R Esupporting

confidence: 86%

Broodstock conditioning, spawning, embryonic and early larval development of a novel baby clam species for aquaculture in the southeast Pacific: Tawera elliptica (Lamarck, 1818)

Barría

Abarca

Colivoro

et al. 2021

Aquaculture Research

View full text Add to dashboard Cite

show abstract

“…The expulsion of gametes in both sexes of A. antiqua agreed with the description of Bustos & Olavarría (2000) and Cerviño (2011), and the sex ratio was close to 1:1 as described by Prida et al (2018). However, the oocytes presented a jelly coat that had not Table 4.…”

Section: Discussionsupporting

confidence: 87%

Spawning induction and embryonic development of the clam Ameghinomya antiqua (King, 1832)

Lizama¹,

Abarca²,

Durán³

et al. 2022

Lat. Am. J. Aquat. Res.

View full text Add to dashboard Cite

Artificial cultivation increases clams' availability and is an alternative to the extraction from natural banks. The culture of clams requires species-specific research in the different growth stages, and studies on the effects and interactions of culture parameters are essential to obtain and control the proper development of larvae. This paper aims to compare methods to induce spawning, describe the embryonic development, and compare the effect of different culture densities on the yield of "D" larvae of the "taca" clam Ameghinomya antiqua. Breeders were collected on the southwest coast of Quinchao Island, Chiloé, Chile. Spawning induction assays were performed comparing different combinations of biological and physical factors. Experiments on the effect of embryonic density in the obtention of "D" larvae were performed, and the embryonic development was described at 11 ± 1°C. The spawning inductions were successfully achieved with the addition of food combined with temperature changes, resulting in the liberation of oocytes with a jelly coat with a diameter of 140 μm. Trochophore larvae were observed at 40 h post-fertilization. The percentage of embryos developed showed significant differences when testing cultures with densities of 20, 40, and 60 embryos mL-1. Experiments with 20 embryos mL-1 density were the ones that obtained a greater number of developed embryos (50%). These results suggest spawning induction with the addition of food and temperature changes with a density of 20 embryos mL-1. This paper describes the embryonic development and technology development for spawning induction for the first time.

show abstract

“…The authors were authorized by the Undersecretary of Fisheries, Republic of Chile, to obtain the biological material in four season sampling (Exempt Resolutions No. 1253/2018and 1720/2019. Sampling was performed in November, 2018 (n = 145), and March (n = 141), May (n = 65) and July, 2019 (n = 165).…”

Section: Methodsmentioning

confidence: 99%

“…Field experiments were approved by the Undersecretary of Fisheries, Republic of Chile (Exempt Resolution No. 1253/2018and 1720/2019.…”

Section: Grant Disclosuresmentioning

confidence: 99%

Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Collado

Chihuailaf²,

Muñoz-Herrera³

et al. 2021

PeerJ

View full text Add to dashboard Cite

Knowing the reproductive biology of threatened species is essential for conservation and to establish proper management plans. Heleobia atacamensis, a freshwater snail only known from two locations in the Atacama Saltpan, northern Chile, is currently classified as Data Deficient on the IUCN Red List and Critically Endangered by the Ministerio del Medio Ambiente of Chile. Based on size-frequency distribution, multivariate analysis of shell measurements, and microdissections, we studied the reproductive strategy, recruitment period, sex ratio and sexual dimorphism in this species. Heleobia atacamensis is an oviparous species, with direct development (non-planktotrophic). Females lay capsules of a single egg from which a juvenile resembling a miniature adult hatches after intracapsular metamorphosis is completed. The development type was confirmed by the observation of a paucispiral protoconch (= protoconch I) using scanning electron microscopy. Recruitment was observed across the four seasons of the year, with an increment at the end of austral summer. Results also showed that sex ratio was 1:1, whereas sexual dimorphism was not detected using univariate and multivariate analysis of the shell. The reproductive data provided in this study are a starting point for future management plans.

show abstract

Evidencia de diferenciación sexual en la almeja <i>Ameghinomya antiqua</i> de la costa chilena y su proporción de sexos

Cited by 4 publications

References 8 publications

Broodstock conditioning, spawning, embryonic and early larval development of a novel baby clam species for aquaculture in the southeast Pacific: Tawera elliptica (Lamarck, 1818)

Broodstock conditioning, spawning, embryonic and early larval development of a novel baby clam species for aquaculture in the southeast Pacific: Tawera elliptica (Lamarck, 1818)

Spawning induction and embryonic development of the clam Ameghinomya antiqua (King, 1832)

Reproductive aspects of the poorly known and critically endangered freshwater snailHeleobia atacamensis(Gastropoda: Truncatelloidea)

Contact Info

Product

Resources

About