scholarly journals Diel behaviour and habitat utilisation by the pearly razorfish during the spawning season

2012 ◽  
Vol 460 ◽  
pp. 207-220 ◽  
Author(s):  
J Alós ◽  
M Cabanellas-Reboredo ◽  
S Lowerre-Barbieri
Keyword(s):  
Spawning Season ◽  
Diel Behaviour

scholarly journals Morphometric Relationship, Growth, and Condition Factor of Flyingfish, Hirundicththys oxycephalus during spawning season

2017 ◽  
Vol 89 ◽  
pp. 012001 ◽  
Author(s):  
Friesland Tuapetel ◽  
Natsir Nessa ◽  
Syamsu Alam Ali ◽  
Sudirman ◽  
B.G. Hutubessy ◽  
...  
Keyword(s):  
Condition Factor ◽  
Spawning Season

Size–Maturity Relationships and Related Observations in Newfoundland Populations of the Lobster (Homarus americanus)

1980 ◽  
Vol 37 (6) ◽  
pp. 945-956 ◽  
Author(s):  
G. P. Ennis
Keyword(s):  
Carapace Length ◽  
Size Range ◽  
Sex Ratios ◽  
Weight Ratio ◽  
Homarus Americanus ◽  
Spawning Season ◽  
Length Ratio ◽  
Maturity Indices

Female maturity ogives for five Newfoundland populations of the lobster (Homarus americanus) gave 50% maturities ranging from 71- to 76-mm carapace length. Sizes at which distinct inflections (indicating onset of maturity) and asymptotes (indicating 100% mature) are present in the abdomen width/carapace length ratio vs. carapace length relationships coincide with the smallest ovigerous and largest immature specimens, respectively, observed in those particular samples. Inflection in the crusher claw weight/whole weight ratio vs. carapace length relationships (used in this paper to indicate onset of maturity in males) occurred at larger sizes than inflections in the abdomen width/carapace length ratios of females.The percentage of nonovigerous females that spawn in a given year generally increases with increasing size. The highest percentage of nonovigerous females tagged with sphyrion tags prior to the spawning season that were ovigerous when recaptured 10–12 mo later was 83.8%. The percentage of ovigerous females with new shells (i.e. molted and spawned in same year) varied between areas and years and ranged from 0 to 38.5% of the total number of ovigerous females in fall samples. The percentage of ovigerous females in samples also varied between areas and years and ranged from 2.6 to 30.4% of the total number of females greater than the size at 50% maturity. In general a greater percentage of females was ovigerous at sizes between the size at 50% maturity and 80 mm (largest subcommercial size) than at commercial sizes.In a sample of nonovigerous females, the size range at which 50% were fertilized (76–80 mm) coincided closely with the size at 50% maturity (75 mm) for the area.At subcommercial sizes (< 81 mm) the sexes were approximately equally represented in fall trap-caught samples but females heavily outnumbered males in diver-caught samples taken over the same period. At commercial sizes, however, males heavily outnumbered females in the trap-caught samples while in diver-caught samples the sexes were equally represented.Key words: lobster (Homarus americanus), maturity ogives, maturity indices, percent ovigerous, sex ratios

Golden Shiner Egg Production during a Spawning Season

2010 ◽  
Vol 72 (3) ◽  
pp. 272-277 ◽  
Author(s):  
Troy Clemment ◽  
Nathan Stone
Keyword(s):  
Egg Production ◽  
Spawning Season ◽  
Golden Shiner

Época reprodutiva de Mugil platanus (Günther, 1880), Pisces Mugilidae da Baia de Paranaguá (Paraná, Brasil)

2001 ◽  
Vol 30 ◽  
Author(s):  
MARIA DE LOURDES PEREIRA ESPER ◽  
MÁRCIA SANTOS DE MENEZES ◽  
WALMIR ESPER
Keyword(s):  
Spawning Season ◽  
Paranaguá Bay

A análise conjunta dos resultados de 311 exemplares de Mugil platanus capturados em diversos pontos da baía de Paranaguá indicou que na região a espécie apresenta um período reprodutivo entre maio e outubro, com picos em agosto e setembro, ocorrendo desova no período que compreende os meses de setembro, outubro e novembro. O IGS (índice gonadossomático), pôde ser utilizado como medida quantitativa do estádio de desenvolvimento gonadal. Provavelmente, as fêmeas maduras do início do período reprodutivo estejam de passagem pela área, desovando em outro local. ABSTRACT Analysis of 311 captured individuals of Mugil platanus from different points of the Paranaguá bay suggested that the species has a long spawning season (from between May and October) in this region. The spawn occurred between September and November, as IGS has indicated. Probably, ripe females from the beginning of the spawning season would be passing along this area to spawn in another place. RÉSUMÉ L’analise conjointe des résultats des 311 exemplaires de Mugil platanus capturés en plusieurs points du baie du Paranaguá, indique que dans la région l’espèce présente une période reproductive entre mai et octobre, surtout en aout et septembre.Des frais ont lieu dans la période comprise entre les mois de septembre, octobre et novembre.L’indicegonadossomatique peut être utilisé comme mesure quantitatif de l’estade de maturation gonatique. Probablement, les femelles mûris du début de le période reproductive sont de passage dans la region en frayant dans un autre lieu.

Patterns of genetic structure of Eurasian perch (Perca fluviatilis L.) in Lake Geneva at the end of the spawning season

2015 ◽  
Vol 41 (3) ◽  
pp. 846-852 ◽  
Author(s):  
Sana Ben Khadher ◽  
Jean-François Agnèse ◽  
Sylvain Milla ◽  
Fabrice Teletchea ◽  
Pascal Fontaine
Keyword(s):  
Genetic Structure ◽  
Perca Fluviatilis ◽  
Spawning Season ◽  
Lake Geneva ◽  
Eurasian Perch ◽  
Perch Perca Fluviatilis

scholarly journals Analysis of reproductive biology and spawning season of the pink ear emperor Lethrinus lentjan, from marine ecosystem

2020 ◽  
Vol 37 ◽  
pp. 1-10
Author(s):  
Elsayed M. Younis ◽  
Nasser A. Al-Asgah ◽  
Abdel-Wahab A. Abdel-Warith ◽  
Mohamed H. Gabr ◽  
Fozi S. Shamlol
Keyword(s):  
Fish Species ◽  
Gonadosomatic Index ◽  
Marine Ecosystem ◽  
Local Population ◽  
Spawning Season ◽  
Monthly Basis ◽  
Population Sampling ◽  
Maturation Rate ◽  
Maturation Index ◽  
One Year

A total of 593 samples of Lethrinus lentjan (Lacepede, 1802) were collected from the Red Sea, Jeddah, Saudi Arabia, to study their productive biology and spawning season of the local population. Sampling was carried out on a monthly basis for a period of one year. The monthly sex ratios indicated that females were dominant throughout the study period, with an overall male:female sex ratio of 1:7.98, although males were larger than females. The highest monthly performance maturation index (PMI), as well as the male and female gonadosomatic index (GSI) and ovarian maturation rate (OMR) were observed in February and March. Histological examination of the gonads confirmed the process of sexual transformation in this fish species, wherein individuals mature first as female, and then change sex to male (protogynous hermaphroditism). Histological sections also showed that the sexual maturation of males of L. lenjtan comprised three main stages, while the sexual development of females could be classified into four main stages. Extended spawning in the form of batches released during different months throughout the year were recorded for this fish species, with the main spawning season in February and March, and an additional, shorter spawning season in September.

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