scholarly journals Reproductive studies of Anchoa marinii Hildebrand, 1943 (Actinopterygii: Engraulidae) in the nearby-coastal area of Mar Chiquita coastal lagoon, Buenos Aires, Argentina

2015 ◽  
Vol 13 (1) ◽  
pp. 221-228 ◽  
Author(s):  
Sofía López ◽  
Ezequiel Mabragaña ◽  
Juan Martín Díaz de Astarloa ◽  
Mariano González-Castro
Keyword(s):  
Coastal Lagoon ◽  
Coastal Area ◽  
Species Abundance ◽  
Diameter Distribution ◽  
Female Size ◽  
Oocyte Diameter ◽  
Multiple Spawner ◽  
First Results ◽  
Ovulatory Follicles ◽  
Reproductive Events

The aim of the present study provides the first results on the reproductive biology of the anchovy, Anchoa marinii, in a nearby-coastal area of Mar Chiquita coastal lagoon, 37º32'00"S 57º19'00"W, Argentina. To perform this, we employed mainly female gonads, at both microscopic and macroscopic levels. The oocyte diameter distribution and the microscopy analysis of oocytes, showed different batches of growing oocytes, suggesting that the anchovy is a multiple spawner, with constant oocytes recruitment all over the reproductive season. The batch fecundity ranged between 749 and 3,207 oocytes for females, and the relative fecundity ranged from 127 to 422 yolked oocytes per female gram (ovary free). The fecundity estimation has been made with yolked oocytes. No correlation between the fecundity estimation and female size and total weight (without ovary) has been found. The estimated L50 values were 74.13 and 73.76 mm TL for females and males, respectively. Shoals of females in advanced maturity phase were recorded, between December to April in the study area. During this period a significant increase of species abundance was correlated with water temperature increase (above 16°C). This fact, together with the detection of post-ovulatory follicles, indicated the existence of reproductive events in the nearby-coastal area of Mar Chiquita coastal lagoon.

scholarly journals Reproductive biology of Parona signata (Actinopterygii: Carangidae), a valuable economic resource, in the coastal area of Mar del Plata, Buenos Aires, Argentina

2020 ◽  
Vol 18 (3) ◽  
Author(s):  
Santiago Julián Bianchi ◽  
Mariano González-Castro
Keyword(s):  
Reproductive Biology ◽  
Histological Analysis ◽  
Gonadosomatic Index ◽  
Reproductive Activity ◽  
Diameter Distribution ◽  
Oocyte Diameter ◽  
Economic Resource ◽  
Multiple Spawner ◽  
Maturation Stages ◽  
Female Relative

ABSTRACT The reproductive biology and life cycle of Parona leatherjacket, Parona signata, present in Mar del Plata (38º 00’S 57º 33’W) coast, was studied. Samples were obtained monthly since January 2018 to February 2019 from the artisanal fishermen and the commercial fleet of Mar del Plata. A histological analysis was carried out and the main biologic-reproductive parameters were estimated: fecundity, oocyte frequency distribution and gonadosomatic index (GSI). Both the macroscopic and microscopic analyses showed reproductive activity in March and November. Mature females were recorded, which showed hydrated oocytes, as was evidenced by the histological procedures. Both, the histological and the oocyte diameter distribution analyses showed the presence of all oocyte maturation stages in ovaries in active-spawning subphase, indicating that P. signata is a multiple spawner with indeterminate annual fecundity. Batch fecundity ranged between 36,426 and 126,035 hydrated oocytes/ female. Relative fecundity ranged between 42 and 150 oocytes/ g female ovary free.

scholarly journals Numerical modeling of the tide in the coast ar-ea Casablanca-Mohammedia (Morocco)

2017 ◽  
Vol 5 (1) ◽  
pp. 31
Author(s):  
Laila Mouakkir ◽  
Soumia Mordane
Keyword(s):  
Numerical Modeling ◽  
Coastal Area ◽  
Earth Rotation ◽  
Numerical Experiments ◽  
Bottom Topography ◽  
Dynamical Equations ◽  
Motion Equations ◽  
Tidal Circulation ◽  
The Earth ◽  
First Results

The objective of this study is to simulate the tidal circulation in the coastal area Casablanca-Mohammedia located on the Moroccan Atlantic. Simulations of the tidal currents of this zone use the 2D version of the MECCA (Model for Estuarine and Coastal Circulation Assessment). These simulations are based on the depth-integrated dynamical equations of turbulent motion. Equations are solved by using the implicit finite-differences techniques. The modelincorporates the actual bottom topography and the effects of the Earth rotation. As forcing mechanism, the model uses the tidal heights prescribed along the open boundaries.As first results, numerical experiments show that the model provides good results compared to those of the altymetric model TPXO.

scholarly journals PENENTUAN UKURAN PERTAMA KALI MATANG GONAD (Lm) CAKALANG (Katsuwonus pelamis Linnaeus, 1758) DI SAMUDRA HINDIA SELATAN BALI

2019 ◽  
Vol 25 (2) ◽  
pp. 135
Author(s):  
Hety Hartaty ◽  
Gussasta Levi Arnenda
Keyword(s):  
Indian Ocean ◽  
Oocyte Development ◽  
Oocyte Diameter ◽  
Skipjack Tuna ◽  
Katsuwonus Pelamis ◽  
Multiple Spawner ◽  
The Indian Ocean ◽  
First Maturity ◽  
Paraffin Method ◽  
Immature Fish

Cakalang tergolong kelompok jenis ikan pelagis besar yang keberadaanya cukup melimpah di perairan Samudera Hindia termasuk perairan selatan Bali. Informasi biologi reproduksi sangat penting terutama untuk mengetahui kapan ikan tersebut memijah sehingga dapat digunakan sebagai dasar pengelolaannya. Cakalang memijah beberapa kali (multiple spawner), hal ini diketahui berdasarkan tingkat perkembangan oosit yang lebih dari satu tingkatan dalam satu gonad aktif. Sampel gonad cakalang betina diperoleh dari Pangkalan Pendaratan Ikan Kedonganan, Bali. Sebanyak 106 ekor cakalang betina dengan kisaran panjang cagak 37-71 cmFL dan kisaran bobot 902-7.214 gram yang teramati. Sampel gonad dalam keadaan segar langsung difiksasi menggunakan larutan buffer-formalin 10% kemudian dianalisis secara histologis menggunakan metode parafin dan pewarnaan HE (Harris-Haemotoxilin dan Eosin). Cakalang betina yang diklasifikasikan sebagai ikan yang belum dewasa (immature) memiliki karakteristik oosit unyolked (UY) yang lebih gelap pewarnaannya, memiliki diameter <156 µm dan Early yolked (EY) yang memiliki diameter 114-249 µm. Cakalang dewasa (mature) memiliki karakteristik perkembangan ovari berupa adanya oosit pada tingkat yang lebih tinggi yaitu advanced yolked (AY) dengan diameter oosit berkisar antara 180-448 µm, migratory nucleus (MN) 239-468 µm dan hydrated (Hy) dimana ukuran oositnya sangat besar yaitu sekitar 459-552 µm dan berbentuk seperti noda merah muda (pink stain). Cakalang betina di perairan Samudera Hindia selatan Bali memiliki perkembangan oosit yang asynchronous (tidak seragam) yang ditandai oleh munculnya beberapa tingkat perkembangan oosit dalam satu ovari. Ukuran panjang pertama kali matang gonad (Lm) cakalang betina yaitu 44,7 cmFL. Cakalang betina dewasa yang berstatus memijah aktif (actively spawning) ditemukan di setiap bulan pengamatan (April-September) dan diduga memijah sepanjang tahun. Skipjack tuna is classified as a large pelagic fish species and has abundant presence in the waters of the Indian Ocean including the waters of southern Bali. Information related to reproductive biology is very important especially to find out when the fish spawn so that they can be used as a basis for its management. Skipjack spawns several times (multiple spawner), this is known based on the level of oocyte development that was more than one level in one active gonad. Samples of female skipjack gonads were obtained from Kedonganan, Bali. A total of 106 female skipjack tuna with length range of 37-71 cmFL and weight range of 902-7,214 grams were observed. Gonad samples in fresh condition were immediately fixed using a 10% buffer-formalin solution then histologically analyzed using the paraffin method and HE staining (Harris-Haemotoxilin and Eosin). Female skipjack classified as immature fish has the characteristics of unyolked oocytes (UY) which are darker in coloration, have a diameter <156 ìm and Early yolked (EY) which has a diameter of 114-249 ìm. Adult skipjack (mature) has the characteristics of ovarian development in the form of oocytes at a higher level, namely advanced yolked (AY) with oocyte diameter ranging from 180-448 µm, migratory nucleus (MN) 239-468 µm and hydrated (Hy) where oocyte size is very large, which is around 459-552 µm and shaped like a pink stain. Female skipjack in the waters of the Indian Ocean south of Bali has an asynchronous (non-uniform) oocyte development which is characterized by the appearance of several levels of oocyte development in one ovary. Size at first maturity (Lm) of female skipjack in Indian Ocean southern Bali was 44.7 cmFL. Adult skipjack females with active spawning status are found every month of observation (April-September) and suspected to spawn throughout the year.

scholarly journals Seasonal variability of maternal effects in European hake Merluccius merluccius

2020 ◽  
Vol 650 ◽  
pp. 125-140
Author(s):  
C García-Fernández ◽  
R Domínguez-Petit ◽  
N Aldanondo ◽  
F Saborido-Rey
Keyword(s):  
Maternal Effects ◽  
Environmental Conditions ◽  
Seasonal Variability ◽  
Larval Growth ◽  
Hepatosomatic Index ◽  
Female Size ◽  
Oocyte Diameter ◽  
Merluccius Merluccius ◽  
Larval Recruitment ◽  
European Hake

Maternal attributes may influence the quantity and quality of offspring and hence, their survival. We evaluated the seasonal variability in maternal effects on developing oocytes and larvae of European hake Merluccius merluccius from the southern stock. Females were collected in 10 different years between 1999 and 2017 in the 3 spawning seasons identified in NW Spain (winter-spring, summer and autumn). Five indices of reproductive trait characteristics (batch fecundity [BF], relative fecundity [RBF], oocyte dry weight [ODW], oocyte diameter [OD] and oocyte lipid droplet diameter [ODD]) and 4 indices of maternal effects (total length [TL], gutted weight, hepatosomatic index [HSI] and Fulton’s K) were analysed. Additionally, larvae were sampled in 2017 during winter-spring and summer spawning peaks to study seasonal variability in their growth and allometry. The results revealed maternal effects on offspring attributes (for both oocytes and larvae) that differed among seasons in terms of productivity and oocyte quality; more and likely better-quality oocytes were produced in the winter-spring. BF, ODW and OD were influenced mostly by female size, ODD was related to HSI, and RBF was not influenced by any maternal attribute. The larval growth rate was similar, although summer larvae had more developed anterior body parts than winter-spring larvae. The temporal differences could be due to differences in maternal attributes and/or environmental conditions; these differences might impact larval survival and hence annual stock recruitment. A multi-year analysis of interactions between environmental conditions and maternal effects is required to understand the complex process of larval recruitment.

scholarly journals Study on vermetid worm shells in Mon coastal area of Myanmar

Bionatura ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 960-965
Author(s):  
Oo Naung Naung
Keyword(s):  
Standard Deviation ◽  
Species Composition ◽  
Shallow Water ◽  
Coastal Area ◽  
Species Abundance ◽  
Rock Pool ◽  
Zonal Distribution ◽  
The Family ◽  
Hard Substrates

Vermetid worm shell of Thylacodes decussatus (Gmelin, 1791) belonging to genus Thylacodes Guettard, 1770 under the family Vermetidae collected at Kyaikkhami, Setse, Kawdut, Sitaw and Kabyarwa in Mon coastal area from January to December 2018. A total of 2561 individuals collected from rocky hard substrates, boulders, rock pool, and water-leveled benches of supra-tidal to lower sub-tidal levels. Regarding percentage species composition, September was maximum species composition, and April was minimum species composition. The range of mean was 47.67-28.67 (September-April), and the standard deviation was 40.66-18.06 (November-February). Maximum and minimum species abundance were recorded in Kawdut coastal area (792 individuals) and Sitaw coastal area (207 individuals), respectively. Moreover, the habitats, zonal distribution and coiling patterns of worm shells in intertidal and shallow water environments of Mon coastal area were studied in brief.

scholarly journals Predicting Carbon Accumulation in Temperate Forests of Ontario, Canada Using a LiDAR-Initialized Growth-and-Yield Model

2020 ◽  
Vol 12 (1) ◽  
pp. 201
Author(s):  
Paulina T. Marczak ◽  
Karin Y. Van Ewijk ◽  
Paul M. Treitz ◽  
Neal A. Scott ◽  
Donald C.E. Robinson
Keyword(s):  
Carbon Stock ◽  
Temperate Forests ◽  
Species Abundance ◽  
Carbon Accumulation ◽  
Growth And Yield ◽  
Diameter Distribution ◽  
Stem Density ◽  
Yield Model ◽  
Validation Data ◽  
Aboveground Carbon

Climate warming has led to an urgent need for improved estimates of carbon accumulation in uneven-aged, mixed temperate forests, where high uncertainty remains. We investigated the feasibility of using LiDAR-derived forest attributes to initialize a growth and yield (G&Y) model in complex stands at the Petawawa Research Forest (PRF) in eastern Ontario, Canada; i.e., can G&Y models based on LiDAR provide accurate predictions of aboveground carbon accumulation in complex forests compared to traditional inventory-based estimates? Applying a local G&Y model, we forecasted aboveground carbon stock (tons/ha) and accumulation (tons/ha/yr) using recurring plot measurements from 2012–2016, FVS1. We applied statistical predictors derived from LiDAR to predict stem density (SD), stem diameter distribution (SDD), and basal area distribution (BA_dist). These data, along with measured species abundance, were used to initialize a second model (FVS2). A third model was tested using LiDAR-initialized tree lists and photo-interpreted estimates of species abundance (i.e., FVS3). The carbon stock projections for 2016 from the inventory-based G&Y model) were equivalent to validation carbon stocks measured in 2016 at all size-class levels (p < 0.05), while LiDAR-based G&Y models were not. None of the models were equivalent to validation data for accumulation (p > 0.05). At the plot level, LiDAR-based predictions of carbon accumulation over a nine-year period did not differ when using either inventory or photo-interpreted species (p < 0.05). Using a constant mortality rate, we also found statistical equivalency of inventory and photo-interpreted accumulation models for all size classes ≥17 cm. These results suggest that more precise information is needed on tree characteristics than we could derive from LiDAR, but that plot-level species information is not as critical for predictions of carbon accumulation in mixed-species forests. Further work is needed on the use of LiDAR to quantify stand properties before this technique can be used to replace recurring plot measurements to quantify carbon accumulation.

scholarly journals Follicular Histomorphometry and Evaluation of Ovarian Apoptosis in Queens of Different Age Groups

2018 ◽  
Vol 44 (1) ◽  
pp. 8
Author(s):  
Isadora Resende de Carvalho ◽  
Daniela Scantamburlo Denadai ◽  
Juliane Teramachi Trevisan ◽  
Heloisa Maria Falcão Mendes ◽  
Sílvia Helena Venturoli Perri ◽  
...  
Keyword(s):  
Ovarian Tissue ◽  
Plasma Concentrations ◽  
Age Groups ◽  
Oocyte Diameter ◽  
Primordial Follicles ◽  
Tunel Reaction ◽  
Area And Perimeter ◽  
Ovulatory Follicles ◽  
The Relationship

Background: In humans and bitchs the age is another factor that may affect the size of ovarian structures, verifying alterations in the quality of the pool and size of follicular structures, which can compromise the use of these structures for in vitro maturation. There are no reports correlating the morphometric characteristics of the follicles and ovarian apoptosis at different ages in cats. The aim of this study was to evaluate the histomorphometric parameters of follicular growth and the relationship with the occurrence of apoptosis in ovarian tissue of young, adult and senile queens.Materials, Methods & Results: Eighteen domestic queens, multiparous, of different breeds and age groups were used in this study and divided into three groups according to their ages: five months to one year - young; (7.8 ± 1.0 months); one to six years - adults (2.8 ± 0.5 years); and more than six years - senile (8.0 ± 0.9 years). Vaginal cytology was performed in order to characterize the estrous phase associated with plasma concentrations of progesterone. The morphology and percentage of the vaginal epithelium cells were evaluated and queens were classified into estrous and non-estrus and plasma concentrations of progesterone were determined. Ovarian samples were collected after ovariohysterectomy to routine histological processin and all follicles were counted and categorized into two groups, non-atresic and atresic. The mean follicular and oocyte diameters were calculated between the measurement of the largest diameter and perpendicular diameter. The relationship between follicle and oocyte were determined using the measurements of diameter, area and perimeter. The apoptotic cells were detected and cells were considered positive when TUNEL reaction was detected. The morphometric index of 1039 follicles were evaluated. Primordial follicles in young animals showed larger diameter, follicular area and perimeter than the structures of adult queens, as well as the unilaminar primary follicles of the same group were larger compared with senile animals (P < 0.05). Comparing adult and younger queens, the first showed a significant decrease of oocyte diameter in primary and unilaminar primary follicles, as well as oocyte area and perimeter (P < 0.05). The values for follicular diameter, oocyte area and perimeter for multilaminar primary, secondary and pre-ovulatory structures did not present statistical differences between the groups (P > 0.05). For the pre-ovulatory follicles there was no positive correlation between the oocyte growths regarding the follicles (P > 0.05). Only in senile animals positive markers for apoptosis were identified in nuclei of primordial follicles. No significant differences concerning the number of follicles and Tunel positive cells were observed between groups (P > 0.05).Discussion: Considering the importance of this study for greater knowledge in the basic aspects for reproductive biotechnologies, we verified that secondary follicles showed the largest diameters and younger animals the largest values for diameter, area and perimeter, suggesting that this age group could be ideal for the use and manipulation of oocytes. The process of follicular atresia is characterized by the occurrence of apoptosis, or programmed cell death when the organism begins to efficiently eliminate dysfunctional cells. The study of follicular apoptosis in small animals, especially in cats, is very important for the development of reproduction biotechnologies. Phenomenon of apoptosis showed no relationship with age in queens, occurring in a physiological, continuous and proportionate manner considering the number of nondominant follicles involved in each estrous cycle.

Reproductive seasonality and the gonadal maturation of silver pomfret Pampus argenteus in the Bay of Bengal, Bangladesh

2020 ◽  
Vol 100 (7) ◽  
pp. 1155-1161 ◽  
Author(s):  
Fatema Akhter ◽  
Md. Moudud Islam ◽  
Midori Iida ◽  
Md. Mahiuddin Zahangir
Keyword(s):  
Reproductive Biology ◽  
Bay Of Bengal ◽  
Gonadosomatic Index ◽  
Spawning Season ◽  
Yolk Granule ◽  
Developmental Cycle ◽  
Oocyte Diameter ◽  
Pampus Argenteus ◽  
Ovulatory Follicles ◽  
Silver Pomfret

AbstractThe silver pomfret (Pampus argenteus) is one of the most commercially important marine fish species in the Bay of Bengal, Indian Ocean. However, detailed information on the reproductive biology of silver pomfret is limited for the Bay of Bengal, Bangladesh. To understand their reproductive biology, especially the gonadal developmental cycle and spawning season, a total of 373 individuals were collected monthly from February 2016 to January 2018 and examined. The total length (TL) and weight (TW) of P. argenteus ranged from 18.82–35.73 cm and 89.26–617.60 g, respectively. The highest gonadosomatic index (GSI) values were observed from April–June with a second (smaller) peak in October. The highest oocyte diameter was observed in May (630.50 ± 96.70 μm), when the fish reached full maturity, and the lowest was observed in July (35.10 ± 7.12 μm), when new eggs began their development for the next spawning season. The maximum number of eggs in the ovary were found in the yolk granule stage in May with a number of post-ovulatory follicles, which indicated that the ovaries developed to a peak leading up to the spawning season. A number of spermatids were also seen in males in April–June along with females. From these detailed observations, it may be concluded that P. argenteus shows two spawning peaks, in May–June and October. This observation will be helpful for the artificial breeding, sustainable management and conservation of this species in the study area.

Spawning and fecundity of Jenyns's sprat, Ramnogaster arcuata, a winter spawner in the temperate waters of the Río de la Plata estuary, Argentina–Uruguay

2008 ◽  
Vol 88 (2) ◽  
pp. 423-429 ◽  
Author(s):  
Karina A. Rodrigues ◽  
Gustavo J. Macchi ◽  
Eduardo M. Acha ◽  
María I. Militelli
Keyword(s):  
Dry Weight ◽  
Total Body Weight ◽  
Female Size ◽  
Rio De La Plata ◽  
Batch Fecundity ◽  
Río De La Plata ◽  
La Plata ◽  
Spawning Frequency ◽  
Multiple Spawner ◽  
Total Body

The reproductive biology of the Jenyns's sprat Ramnogaster arcuata in the Río de la Plata area was studied using macroscopic and histological analysis of ovaries. Samples were collected during two research surveys carried out in June 1998 and June 1999. In addition monthly occurrences of this species from historical data were analysed. Jenyns's sprat specimens were mainly observed in open waters of the estuary during winter months. Most of the females collected during June 1998 and 1999 were in the spawning stage. This pattern differs from fish that reproduce in the estuarine waters of the Río de la Plata, which spawn during spring and summer. These results suggest that conditions of productivity and larval retention in the estuary also remain during winter months. This characteristic might be useful for R. arcuata larvae in avoiding competition with other estuarine spawners. Jenyns's sprat is a multiple spawner with indeterminate annual fecundity. A preliminary estimate of spawning frequency (N = 220) indicated a daily percentage of females with postovulatory follicles of 17.35%, which suggests that this species spawns on average once every six days. Batch fecundity, estimated from counts of hydrated oocytes from 40 females, ranged from 669 to 2026 hydrated oocytes in 1998 and from 570 to 1830 hydrated oocytes in 1999. Batch fecundity was fitted to a linear function of total body weight (without ovary) in 1999. Mean relative fecundity was 234 hydrated oocytes per female gram (ovary free) in 1998 and 155 hydrated oocytes per female gram (ovary free) in 1999, and no significant relationship was observed between this parameter and female size. The dry weight of 100 hydrated oocytes ranged between 3.9 and 6.3 mg, these values being significantly higher than those estimated for other species of the Río de la Plata estuary.

The Reproductive Cycles of Monodonta Lineata and Gibbula Umbilicalis on the Coast of Mid-Wales

1985 ◽  
Vol 65 (4) ◽  
pp. 993-1008 ◽  
Author(s):  
P. R. Garwood ◽  
M. A. Kendall
Keyword(s):  
Gonad Development ◽  
Diameter Distribution ◽  
Oocyte Diameter ◽  
Gamete Release ◽  
Spawning Period ◽  
Jelly Coat ◽  
Reproductive Cycles

At Aberaeron, Dyfed, mid-Wales, the two trochid species, Monodonta lineata and Gibbula umbilicalis breed during the summer months. M. lineata showed a discrete spawning period in late July in both 1980 and 1983, whilst G. umbilicalis spawned in August in both years, though with gamete release prolonged into September in 1980. In both species gonad development begins in April/May, and by June the characteristic bimodal oocyte diameter distribution of mature females has been established. Vitellogenesis and the development of a jelly coat around the oocyte begin when the oocytes have a diameter of 70–80 μm, with mature oocytes reaching 140–180 μm in diameter, excluding the jelly coat.

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