Changes in levels of major yolk protein in the coelomic fluid and gonad during the reproductive cycle in wild sea urchins,Mesocentrotus nudus

AbstractBoth female and male sea urchins accumulate the major yolk protein (MYP) in the nutritive phagocytes of immature gonads before gametogenesis, and MYP is the most abundant protein in the coelomic fluid of both sexes. In females, MYP in the coelomic fluid is taken up by the nutritive phagocytes and transported to the growing oocytes. This study examined quantitative changes of MYP in the coelomic fluid of both sexes during the reproductive cycle of wild sea urchins,Mesocentrotus nudus. Levels of MYP in the coelomic fluid of females increased and reached a peak at the histological pre-mature stage of gonad activity (i.e. Stage 3), and positive correlation between the MYP level and the gonadosomatic index (GSI) was observed. In male sea urchins the level of MYP in the coelomic fluid increased at the pre-mature stage, though positive correlation between the MYP level and GSI was not observed. These results indicate that MYP in the coelomic fluid is suitable as a biomarker of the onset and progression of sexual maturity in female sea urchins.

Download Full-text

Reproductive patterns of the black starry sea urchin Arbacia stellata in Punta Banda, Baja California, Mexico

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315419000316 ◽

2019 ◽

Vol 99 (06) ◽

pp. 1379-1391 ◽

Cited By ~ 1

Author(s):

Julia Patricia Díaz-Martínez ◽

Eugenio De Jesús Carpizo-Ituarte ◽

Francisco Benítez-Villalobos

Keyword(s):

Size Distribution ◽

Sea Urchin ◽

Reproductive Cycle ◽

Net Primary Production ◽

Gonadosomatic Index ◽

Sampling Site ◽

Gonadal Development ◽

Oocyte Size ◽

Local Conditions ◽

Positive Correlation

AbstractWidely distributed species such as Arbacia stellata adjust patterns of their life history according to local conditions. In the present study the reproductive cycle of this species was analysed throughout a sampling year. Gonadal development cycle, sex ratio, actual fecundity and oocyte size distribution were characterized and the relationship of these reproductive characteristics with environmental variables such as sea surface temperature, photoperiod, chlorophyll a and net primary production evaluated. Our results showed that A. stellata is a gonochoric sea urchin. Gametogenesis was classified into six stages for both sexes (immature, growth, pre-maturity I, pre-maturity II, mature and spawning) and no synchrony was observed for the gonads between individuals. The female to male ratio was close to 1:1 in most months. The gonadosomatic index (GSI) showed significant differences between sexes or months; however, the highest values were observed during spring, with positive correlation with chlorophyll a. No significant differences were observed in the maturity index (MI) between sexes, with a positive correlation with temperature but negative with chlorophyll. Actual fecundity showed wide variations throughout the year and correlation with chlorophyll a and temperature. Oocyte size distribution was unimodal and the predominant frequency was that of mature oocytes. The reproductive cycle of A. stellata has a semi-continuous pattern for both sexes and partial spawning throughout the year in the sampling site. We observed nutrient assimilation in the gonads during spring and a larger reproductive activity from late summer to early winter.

Download Full-text

Reproductive cycle of Bolinus brandaris (Gastropoda: Muricidae) in the Gulf of Gabès (southern Tunisia)

Mediterranean Marine Science ◽

10.12681/mms.325 ◽

2013 ◽

Vol 14 (1) ◽

pp. 24 ◽

Cited By ~ 7

Author(s):

K. ELHASNI ◽

P. VASCONCELOS ◽

M. GHORBEL ◽

O. JARBOUI

Keyword(s):

Reproductive Cycle ◽

Sexual Maturity ◽

Fishery Management ◽

Gonadosomatic Index ◽

Condition Index ◽

Spawning Season ◽

Gonad Maturation ◽

Gulf Of Gabes ◽

Gulf Of Gabès ◽

Bolinus Brandaris

The reproductive cycle of the purple dye murex (Bolinus brandaris) from the Gulf of Gabès was studied through gonad histology and calculation of bio-physiological indices (general condition index - K and gonadosomatic index - GSI). The shell length at first sexual maturity (SL50) of B. brandaris was also investigated using a macroscopic maturation scale. The population sex ratio was statistically unbalanced (M:F = 1:1.5), with a significant dominance of females. Monthly variation in gonad maturation stages, K and GSI revealed that B. brandaris has an annual reproductive cycle, long period of gonadal activity and slight asynchrony between sexes. The spawning season extended between April and July, with a clear spawning peak from May to June. The SL50 was reached at 56.4 mm in females and 54.6 mm in males. At present, B. brandaris has no commercial value in Tunisia, but it is predictable that it will become a fishery-exploited species in the near future. The present data, particularly the timing of spawning season and the size at first sexual maturity, constitute baseline information for the proposal of fishery management measures, aiming to ensure sustainable exploitation and long-term preservation of this alternative fishing resource.

Download Full-text

Age-related NADH oxidase (arNOX) activity is significantly reduced in coelomic fluid of long-lived sea urchins

International Aquatic Research ◽

10.1186/2008-6970-5-2 ◽

2013 ◽

Vol 5 (1) ◽

pp. 2

Author(s):

Eric Talbert ◽

Andrea Bodnar ◽

Dorothy M Morré ◽

D James Morré

Keyword(s):

Nadh Oxidase ◽

Sea Urchins ◽

Coelomic Fluid ◽

Age Related

Download Full-text

Reproductive cycle of the Manila clam (Ruditapes philippinarum): an intensively harvested invasive species in the Tagus Estuary (Portugal)

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315417001382 ◽

2017 ◽

Vol 98 (7) ◽

pp. 1645-1657 ◽

Cited By ~ 5

Author(s):

Paula Moura ◽

Paulo Vasconcelos ◽

Fábio Pereira ◽

Paula Chainho ◽

José Lino Costa ◽

...

Keyword(s):

Invasive Species ◽

Reproductive Cycle ◽

Sexual Maturity ◽

Ruditapes Philippinarum ◽

Manila Clam ◽

Tagus Estuary ◽

Gonad Maturation ◽

Oocyte Diameter ◽

Ruditapes Decussatus ◽

Spawning Period

The present study aimed to describe the reproductive cycle and estimate the size at sexual maturity of the Manila clam (Ruditapes philippinarum) in the Tagus Estuary (Portugal). Specimens were collected monthly from September 2013 to December 2015 during fishing surveys using bivalve dredges. The gametogenic cycle was described in detail using gonad histology and monitored throughout the study period by the monthly variation in the frequency of gonad maturation stages, mean gonadal index and mean oocyte diameter. This invasive population of R. philippinarum displayed synchronous gonadal development between sexes, with ripening occurring mainly in April and May followed by an extensive spawning period until November–December. Individuals reached the size at first sexual maturity at 29.4 mm in shell length (i.e. before 1 year old). Furthermore, the reproductive strategy, dynamics and potential were compared between the invasive R. philippinarum and the native congeneric carpet shell clam (Ruditapes decussatus). Overall, the data gathered in this study constitutes valuable baseline information to propose conservation strategies and implement management measures to minimize the harmful impacts caused by this invasive species on local ecosystems and native biodiversity, particularly over populations of autochthonous bivalves.

Download Full-text

Changes in the thyroid gland during the reproductive cycle of the male vespertilionid bat, Scotophilus heathi

Revista Brasileira de Biologia ◽

10.1590/s0034-71081998000400018 ◽

1998 ◽

Vol 58 (4) ◽

pp. 707-716 ◽

Cited By ~ 5

Author(s):

A. KRISHNA ◽

K. SINGH

Keyword(s):

Body Weight ◽

Seasonal Variation ◽

Thyroid Gland ◽

Seasonal Change ◽

Reproductive Cycle ◽

The Body ◽

Winter Dormancy ◽

High Concentration ◽

Positive Correlation ◽

Low Concentration

The aim of present study was to compare the changes in thyroid gland with the reproductive cycle of S. heathi. Thyroid showed marked seasonal variation in weight, quantity of colloid and follicular epithelial height, suggesting the thyroid gland to be inactive during quiescence and winter dormancy and active during the time of recrudescence and breeding similarly to the testicular cycle. Plasma thyroxin (T4) concentration showed a significant seasonal change with high concentration during breeding and post-breeding and low concentration during quiescence. However, the T4 concentration increased from breeding to post-breeding phase, when the testes weight was declining. It is suggested that in S. heathi the positive correlation between thyroid and testicular cycles occurs only during the phases of the reproductive cycle when the body weight and testicular activity are also closely correlated.

Download Full-text

Reproductive cycle and sexual maturity of Sphoeroides annulatus (Jenyns, 1842) (Tetraodontiformes, Tetraodontidae) from the coast of Mazatlan, Sinaloa, Mexico

Journal of Applied Ichthyology ◽

10.1111/j.1439-0426.2011.01754.x ◽

2011 ◽

Vol 27 (5) ◽

pp. 1190-1196 ◽

Cited By ~ 6

Author(s):

R. Sánchez-Cárdenas ◽

M. Arellano-Martínez ◽

M. C. Valdez-Pineda ◽

R. E. Morán-Angulo ◽

B. P. Ceballos-Vázquez

Keyword(s):

Reproductive Cycle ◽

Sexual Maturity

Download Full-text

Reproductive Cycle, Size and Age at Sexual Maturity, and Sexual Dimorphism in the Stream-Breeding Frog Crossodactylus schmidti (Hylodidae)

South American Journal of Herpetology ◽

10.2994/sajh-d-17-00060.1 ◽

2019 ◽

Vol 14 (1) ◽

pp. 1 ◽

Cited By ~ 2

Author(s):

Vinícius Matheus Caldart ◽

Luiza Loebens ◽

Amanda Jamile Carvalho Brum ◽

Lívia Bataioli ◽

Sonia Zanini Cechin

Keyword(s):

Sexual Dimorphism ◽

Reproductive Cycle ◽

Sexual Maturity

Download Full-text

Seasonal variations in the population biology of Salmostoma bacaila (Cyprinidae) from a tributary of the Payra River, Bangladesh

Zoology and Ecology ◽

10.35513/21658005.2019.2.7 ◽

2019 ◽

pp. 113-119

Author(s):

Ahamed Ahamed ◽

Faruque Ahmed Zoarder ◽

Jun Ohtomi

Keyword(s):

Sex Ratio ◽

Seasonal Variations ◽

Population Biology ◽

Sexual Maturity ◽

Condition Factor ◽

Gonadosomatic Index ◽

Spawning Season ◽

Frequency Distributions ◽

Size At Sexual Maturity ◽

Management And Conservation

Some biological parameters of Salmostoma bacaila – including sex ratio, length-frequency distributions (LFDs), size at sexual maturity, spawning season, length-weight relationships (LWRs) and condition factor – were studied. Samples were collected seasonally during June 2017 to May 2018 from a tributary of the Payra River. The overall sex ratio was significantly different from the expected value of 1:1 (p < 0.001), in favour of male specimens. Females were significantly larger than males. Size at sexual maturity was estimated at 7.6~7.7 cm total length. Seasonal variations in the gonadosomatic index (GSI) indicate that the main spawning season is from spring to summer. The LWRs showed negative allometric growth in both sexes, but with clear seasonal variation. Fulton’s condition factor varied in both sexes and was attributed to variations in GSI with maturity. The fin¬dings of this study will be helpful for management and conservation of S. bacaila populations.

Download Full-text