scholarly journals Temporal Dynamics of Reproduction of the Neotropical Fish,Crenicichla menezesi(Perciformes: Cichlidae)

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Andréa Soares de Araújo ◽  
Wallace Silva do Nascimento ◽  
Maria Emília Yamamoto ◽  
Sathyabama Chellappa
Keyword(s):  
Sexual Maturity ◽  
Temporal Dynamics ◽  
Condition Factor ◽  
Cichlid Fish ◽  
Gonadal Development ◽  
Neotropical Fish ◽  
Spawning Period ◽  
Gonadal Maturation ◽  
Development Cycle ◽  
Partial Spawner

The reproductive biology and the gonadal development cycle of the Neotropical cichlid fish,Crenicichla menezesi, is described. This species exhibits sexual dimorphism only during the spawning season. First sexual maturity of females is attained earlier than the males. Both macroscopic and histological investigations of ovaries and testes revealed four stages of gonadal maturation. Mean batch fecundity of females was 372 (±10,41) of mature oocytes. This species is a partial spawner, with an extended spawning period. Monthly values of GSI and the condition factor are negatively correlated during the gonadal development cycle of this species.

scholarly journals Gonad Maturity and Fecundity of Bluecheek Silver Grunt (Pomadasys argyreus) in Palabuhanratu Bay, West Java

2020 ◽  
Vol 3 (1) ◽  
pp. 10-15
Author(s):  
Mona Agatha ◽  
Yonvitner ◽  
Rahmat Kurnia
Keyword(s):  
Sex Ratio ◽  
Condition Factor ◽  
Gonadosomatic Index ◽  
Gonadal Development ◽  
Gonad Maturity ◽  
Fish Samples ◽  
Males And Females ◽  
First Maturity ◽  
Partial Spawner ◽  
Fish Spawn

A total of 806 fish samples were collected from the catch of local fishermen. The sex ratio of Pomadasys argyreus was 1:0,90. Four stages of gonadal development were observed in males and females, which dominated by stage I and II (immature). The highest gonadosomatic index (GSI) in males was 1,14 in September, while in females was 1,80 in May. Length at first maturity of Pomadasys argyreus was 140,12 mm for males and 135,01 mm for females. The highest value of condition factor was 1,05 for males and 1,10 for females. This fish spawn partially (partial spawner) and estimated spawns throughout the year with a spawning peak in June.

scholarly journals Length-weight relationship and condition factor of two sympatric Rutilus (Rrafinesque, 1820) species from Lake Skadar (Montenegro)

2012 ◽  
Vol 64 (3) ◽  
pp. 991-994 ◽  
Author(s):  
D. Milosevic ◽  
V. Pesic ◽  
D. Petrovic ◽  
A. Pavicevic ◽  
D. Maric
Keyword(s):  
Sexual Maturity ◽  
Condition Factor ◽  
Allometric Growth ◽  
Spawning Period ◽  
Weight Relationship ◽  
Lake Skadar

Two species from the genus Rutilus (Rafinesque, 1820), R. prespensis and R. albus inhabit Lake Skadar. The conditional factor (K) and length-weight relationships (LWRs) of 165 specimens were studied from January 2008 to January 2009. Based on the LWRs, it was found that R. albus exhibited isometric growth to the stage of sexual maturity, after which it exhibited allometric growth; R. prespensis, exhibited only allometric growth. The conditional factor for the both species significantly differed between months. The spawning period of R. albus began in February, while for R. prespensis it was April-May.

scholarly journals L’ INFLUENCE DE L’ALIMENTATION ET DE LA DENSITÉ DE LA POPULATION SUR LE DÉVELOPPEMENT DES GONADES CHEZ TROIS ESPÈCES DE POISSONS

1999 ◽  
Vol 4 (1) ◽  
Author(s):  
MARIA CECÍLIA BERNARDES PADILHA TRIPPIA
Keyword(s):  
Population Density ◽  
Condition Factor ◽  
Gonadosomatic Index ◽  
Gonadal Development ◽  
Total Weight ◽  
Gonadal Maturation ◽  
Positive Correlation ◽  
Total Length ◽  
Maturity Stages ◽  
Gonadal Index

Foi realizado o estudo do comprimento total, peso total e peso das gônadas; dos índices gonadais e do fator de condição (K), em relação à variação da densidade populacional em três diferentes tratamentos do experimento com Trichogaster trichopterus e, além dos estudos citados, também foi realizada no experimento com Hemichromis bimaculatus, a análise dos estádios de maturação gonadal encontrados, em relação à quantidade de alimento ofertado em quatro diferentes tratamentos. O estudo do fator de condição em relação à quantidade de alimento ofertado em três diferentes tratamentos dos experimentos com Hyphessobrycon callistus e Trichogaster trichopterus também foi realizado. O comprimento total, peso total e peso das gônadas revelaram a tendência de serem inversamente proporcionais à densidade populacional. Porém o comprimento total e o peso total, de H. bimaculatus, revelaram a tendência de serem diretamente proporcionais à quantidade de alimento ofertado. Tanto o índice gonadal como o índice gônado-somático foram mais elevados no tratamento de densidade populacional intermediária, em T. trichopterus. Os menores valores destes índices, em H. bimaculatus, foram registrados no tratamento 3 e os maiores valores nos tratamentos 1 e 2, respectivamente. Em T. trichopterus, experimento quanto à variação da densidade populacional, observaram-se valores muito semelhantes do fator de condição entre os tratamentos 1 e 2. O maior e o menor valor do fator de condição em H. bimaculatus foram observados nos tratamentos 1 e 4, respectivamente. Em H. callistus, o maior e o menor valor do fator de condição foram encontrados, respectivamente, nos tratamentos de maior oferta alimentar e de oferta alimentar intermediária. Em T. trichopterus, o fator de condição revelou a tendência de ser diretamente proporcional à quantidade de alimento ofertado. A espécie H. bimaculatus não evidenciou apresentar tendência à correlação positiva entre maturação gonadal e quantidade de alimento ofertado. Abstract Studies on the Trichogaster trichopterus gonadal development in regard to the variation of the population density were carried out. The following parameters were studied: the total length, total weight and gonads weight; the gonads indexes and the condition factor (K). In the experiment with Hemichromis bimaculatus was concomitantly analysed the maturity stages of the gonads in relation to the quantity of nourishment offered. The nourishment influence in the condition factor (K) of Hyphessobrycon callistus and Trichogaster trichopterus has been analysed. The total length, total weight and gonads weight were estimated to be inversely proportional to the population density. However, the total length and total weight in H. bimaculatus were estimated to be directly proportional to the amount of nourishment offered. The gonadal index and the gonadosomatic index were higher in the treatment of the intermediate population density, in T. trichopterus. The smallest values of these gonads indexes, in H. bimaculatus, were recorded in treatment 3 and the biggest values in treatment 1 and 2, respectively. In T. trichopterus, an experiment about the variation of the population density, similar values were observed between treatment 1 and 2, in relation to the conditional factor. The biggest and smallest values about the conditional factor, in H. bimaculatus, were observed in treatment 1 and 4, respectively. In H. callistus, the highest and the lowest values of the conditional factor were observed, respectively, in the treatment of the highest level of nourishment offered and in the treatment of the intermediate nourishment offered. In T. trichopterus, the conditional factor tended to be directly proportional to the amount of nourishment offered. In the species H. bimaculatus the tendency on the positive correlation between gonadal maturation and amount of nourishment offered is not evident.

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

2017 ◽  
Vol 98 (7) ◽  
pp. 1645-1657 ◽  
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.

scholarly journals Invasive non-native species of fish in upper Paraná river Basin, Brazil: variations of caloric content in Cichla kelberi

2012 ◽  
Vol 10 (2) ◽  
pp. 401-408 ◽  
Author(s):  
Luis Alberto Espínola ◽  
Horácio Ferreira Júlio Junior ◽  
Evanilde Benedito
Keyword(s):  
Native Species ◽  
Condition Factor ◽  
Gonadosomatic Index ◽  
Reproductive Period ◽  
Paraná River ◽  
Caloric Content ◽  
Fish Food ◽  
Gonadal Maturation ◽  
Parana River ◽  
Upper Paraná River

The allocation of assimilated energy may be influenced by seasonal changes, growth, and reproductive cycle of fish, food consumption and environmental conditions. The objective of this research was to evaluate the energetic variations of Cichla kelberi in the upper Paraná River floodplain, analyzing the caloric content in muscles, gonadosomatic index (GSI), and the condition factor between assessed systems, sex, and stage of gonadal maturation. The results obtained in the present study permit assuring that this is a species that efficiently converts the resources of the environment into energy. Although presenting higher condition factor in the environment where there is a greater ease in getting food (Paraná subsystem), the energy identified in the muscles was the same in both subsystems. During the process of gonadal maturation there is optimization in energy accumulation in the muscles of females, before and after reproductive period, and somatic growth occurs significantly when the individual is not reproducing. Further detailed studies on ecological mechanisms influencing the success of the species, as the presence of competitors and preference for native preys, are needed to implement effective management measures aimed at preventing that the species proliferation in the environment is even more damaging to local biodiversity.

scholarly journals Growth and reproduction properties of endemic Capoeta kosswigi and Barbus ercisianus in the Deliçay Stream (Van, Turkey)

2021 ◽  
Vol 38 (3) ◽  
pp. 293-302
Author(s):  
Ataman Altuğ Atıcı ◽  
Ahmet Sepil ◽  
Fazıl Şen ◽  
Asude Çavuş
Keyword(s):  
Sexual Maturity ◽  
Condition Factor ◽  
Fork Length ◽  
Lake Van ◽  
Reproductive Characteristics ◽  
Lake Van Basin ◽  
Growth And Reproduction

In this study, the growth and reproductive characteristics of Capoeta kosswigi Karaman, 1969 and Barbus ercisianus Karaman, 1971, which are endemic to the Lake Van Basin, in Deliçay (Van) were investigated. A total of 309 C. kosswigi and 288 B. ercisianus specimens were caught by electrofishing between April and August 2018. The fork length of C. kosswigi and B. ercisianus ranged from 3.7-26.1 cm and from 4.3-22.7 cm, and the total weights ranged from 0.6-227.4 g and from 1.2-140.0 g, respectively. The most intensive catching was in C. kosswigi population of 5.0-6.9 (27.5%) cm and 0-19.9 (67.0%) g in the groups, and 12.0-13.9 (24.7%) cm and 0-9.9 (23.3%) g groups in B. ercisianus. Condition factor was determined as 1.305±0.008 (0.798-1.886) in C. kosswigi and 1.158±0.006 (0.864-1.559) in B. ercisianus. The length-weight relationships were calculated as W = 0.01435 × L2.952 (r2 = 0.996) for C. kosswigi and W = 0.01276 × L2.959 (r2 = 0.994) for B. ercisianus. The M:F ratio was calculated as 1:0.15 in C. kosswigi and 1:0.64 in B. ercisianus. It was established that C. kosswigi attained sexual maturity when they reached to 11 cm fork length for males, 18 cm fork length for females. Maturation of B.ercisianus individuals occurred at 9 cm fork length in males and 12 cm fork length in females. The spawning in C. kosswigi was observed from 1st week of May to 2nd week of July, and in B. ercisianus from 1st week of May to 1st week of August. It may be suggested that minimum catching size must be 20 cm fork length for C. kosswigi and 15 cm fork length for B. ercisianus.

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

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.

Chamelea gallina reproductive biology and Minimum Conservation Reference Size: implications for fishery management in the Adriatic Sea

BMC Zoology ◽  
2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Giada Bargione ◽  
Fortunata Donato ◽  
Giulio Barone ◽  
Massimo Virgili ◽  
Pierluigi Penna ◽  
...  
Keyword(s):  
Sexual Maturity ◽  
Adriatic Sea ◽  
Seawater Temperature ◽  
Reproductive Capacity ◽  
Great Effort ◽  
Important Species ◽  
Spawning Period ◽  
The Past ◽  
Chamelea Gallina ◽  
Size At Sexual Maturity

Abstract Background The striped venus clam Chamelea gallina is an economically important species in Adriatic Sea fisheries. The use of hydraulic dredging for its catch has a long history in Italy and its management faced several stages of development in the last 40 years. A great effort has been made in the past two decades to move from poorly or weakly managed fisheries to a well-structured co-management system to improve the sustainability of this fishery. However, a prerequisite for appropriate resource management is a sound knowledge of the biology and reproductive strategy of the species. Results We investigated three major biological features– the gametogenic cycle, size at sexual maturity and partial fecundity – by microscopic, histological and video analysis techniques. We demonstrated that its breeding season is driven by rises in seawater temperature and chlorophyll-a concentration and that its spawning period lasted from March to September. Size at sexual maturity was reached very early in the life cycle. As regards partial fecundity – the number of mature oocytes potentially released by females with ripe gonads in a single release event – varied in relation to size. Nevertheless, the reduction on the Minimum Conservation Reference Size (MCRS) from 25 to 22 mm (Delegated Regulation (EU) 2020/2237) lead to a 40% reduction in the number of emitted eggs. Conclusions We suggest that the ability of Adriatic clam stocks to withstand the strong fishing pressure of the past 40 years and the present one is due to their high reproductive potential and multiple spawning events combined with the effect of management measures (closed areas/seasons, quota, MCRS) and technical constraints on the gear and the sieve on board. Moreover, since the reduced MCRS for Venus shells is still larger than the size at maturity, it will probably not be detrimental to the reproductive capacity of the stock.

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