The biology of Acanthoclinus quadridactylus (Bloch and Schneider) (Teleostei-Blennioidea). II. Breeding and Development

1968 ◽  
Vol 19 (1) ◽  
pp. 9 ◽  
Author(s):  
JB Jillett
Keyword(s):  
Annual Variation ◽  
Condition Factor ◽  
Juvenile Fish ◽  
Gonad Maturation ◽  
Egg Mass ◽  
Gonad Weight ◽  
Male Fish ◽  
The Third ◽  
Males And Females ◽  
Fish Spawn

A. quadridactylus attains sexual maturity in the third year of life, after which there is a seasonal cycle of gonad maturation and depletion. The condition factor of fish varies through the year and annual variation is comparable for both males and females. Fluctuations of condition factor for males cannot be explained solely in terms of changes in gonad weight. Egg masses were found on the shore from July to January, although most fish spawn between August and November. Development is described from late cleavage to eleven days after hatching. In nature, each egg mass is guarded by a male fish until the larvae hatch and enter the plankton. Planktonic life probably lasts nearly three months before the juvenile fish settle and adopt the adult habit.

scholarly journals The influence of the 1992-1993 el niño on the reproductive biology of Scomber japonicus peruanus (Jordán & Hubb, 1925)

2009 ◽  
Vol 57 (4) ◽  
pp. 263-272 ◽  
Author(s):  
Hilda Caramantin-Soriano ◽  
Luz Amelia Vega-Pérez ◽  
Miguel Ñiquen
Keyword(s):  
El Niño ◽  
Condition Factor ◽  
El Nino ◽  
Gonadosomatic Index ◽  
Fork Length ◽  
The Body ◽  
Gonad Maturation ◽  
Scomber Japonicus ◽  
Gonad Weight ◽  
Peruvian Coast

The influence of the 1992-1993 El Niño events on the reproductive behavior of the Scomber japonicus peruanus (Chub mackerel) was studied from samples collected monthly, along the Peruvian coast (3º23'S-14º00'S), from January 1990 to December 1993. The monthly variation of the gonadosomatic index and the frequency of the periods of gonad maturation evidenced that the spawning of the species occurred all year long, being more intense in summer. The values of the gonadosomatic index were higher during the occurrence of the 1992-1993 El Niño, while the body weight and gonad weight decreased. Regarding the condition factor, its values decreased in females over 35 cm in fork length.

scholarly journals Fecundity and condition of Chrysichthysnigrodigitatus (Family Claroteidae) in Yewa Lagoon, Nigeria

2020 ◽  
Vol 40 (2) ◽  
pp. 183-188
Author(s):  
I. O. Taiwo ◽  
O. A. Olopade ◽  
A. I. Tiamiyu
Keyword(s):  
Body Weight ◽  
Standard Length ◽  
Condition Factor ◽  
Gonadosomatic Index ◽  
Gonad Weight ◽  
Female Fish ◽  
Male Fish ◽  
Better Than

The minimum and maximum standard length of females caught was 8.0cm (14.5g body weight) and 14.6cm (53.4g body weight) respectively while the males were 10.1cm (19.8g) and 17.1cm (68.6g). The gonadosomatic index (GSI) for females ranged between 6.55 and 25.57 while males ranged between 5.68 and 16.55. Significant (P<0.05) relationships were observed between standard length, body weight, gonad weight and fecundity. There was significant (P<0.05) relationship between body weight and fecundity. Body weight and GSI had no significant (P>0.05) relationship with condition factor in C. nigrodigitatus in Yewa Lagoon. The condition factor (K) ranged between 1.58 and 2.92 for the females while males ranged between 1.08 and 2.79. The condition of female fish was slightly better than that of male fish of the same length.

scholarly journals Reproductive dynamics of Leporinus obtusidens captured downstream from an important hydropower Station in Brazil

2013 ◽  
Vol 65 (5) ◽  
pp. 1419-1426 ◽  
Author(s):  
E.S. Andrade ◽  
V.O. Felizardo ◽  
L.D.S. Murgas ◽  
M.M. Drumond ◽  
M.G. Zangerônimo ◽  
...  
Keyword(s):  
Condition Factor ◽  
Gonadosomatic Index ◽  
Reproductive Period ◽  
Hepatosomatic Index ◽  
Hydroelectric Power Station ◽  
Gonad Maturation ◽  
Hydroelectric Power ◽  
Power Station ◽  
Ratio Condition ◽  
Males And Females

This study evaluated the reproductive dynamics and gonadal morphology of piaparas (Leporinus obtusidens) captured downstream from the Funil Hydroelectric Power Station. The 107 piaparas evaluated were captured monthly from Sep 2006 to Aug 2007. The data were stratified among the seasons to evaluate gonad maturation and the reproductive period was determined by assessing the gonadosomatic index, hepatosomatic index, abdominal fat index (AFI), weight:length ratio, condition factor and sexual proportion. The reproductive period lasted from winter to summer (Jul-Mar) in females and from spring to autumn (Sept-Jun) in males. AFI was high during and after the reproductive period in females and only during the reproductive period in males. The highest HIS values for males and females were obtained in spring and summer (Sept-Mar). The females observed did not spawn and showed follicular atresia. These characteristics suggest that L. obtusidens does not use the study area as a reproductive site and probably migrates for this purpose.

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.

The Life History and Habits of Chrysomela crotchi Brown (Coleoptera: Chrysomelidae) in Northwestern Ontario

1965 ◽  
Vol 97 (5) ◽  
pp. 541-549 ◽  
Author(s):  
E. P. Smereka
Keyword(s):  
Life History ◽  
Adult Stage ◽  
Egg Mass ◽  
Predator Species ◽  
Control Factors ◽  
Northwestern Ontario ◽  
History Of ◽  
Males And Females ◽  
Overwintering Mortality ◽  
Larval Parasites

AbstractThe life history of Chrysomela crotchi, a univoltine species commonly found on trembling aspen, was studied in northwestern Ontario from 1959 to 1962. The most striking feature of its life history was the longevity of adults, which were capable of overwintering two successive years. Overwintered adults became active and began feeding in late May, and oviposition occurred from early June to late July. The incubation period was approximately 10 days and the three larval instars required approximately one month for development to the adult stage.Females laid more eggs during their second season and the highest number laid was 326. The number of eggs in an egg mass averaged 37.6, and the average interval between the deposition of egg masses was 4 days. Males and females mated more than once, but only one mating was necessary for a female to produce viable eggs throughout the season. Males were capable of fertilizing more than one female and remained potent for more than one season.Parasitism was low, and only two species of larval parasites were reared. Several predator species were observed preying on the immature stages. Predation and overwintering mortality appeared to be the most important control factors.

scholarly journals The occurrence of Contracaecum sp. larvae (Nematoda : Anisakidae) in the catfishClarias gariepinus (Burchell) from Lake Chivero, Zimbabwe

2004 ◽  
Vol 71 (1) ◽  
Author(s):  
M. Barson
Keyword(s):  
Significant Relationship ◽  
Condition Factor ◽  
Clarias Gariepinus ◽  
Parasite Prevalence ◽  
Body Cavity ◽  
The Body ◽  
Nematode Parasites ◽  
Significant Difference ◽  
Third Stage ◽  
Males And Females

Clarias gariepinus were collected from Lake Chivero, Zimbabwe, and examined for nematode parasites from November 2000 to May 2002. Of the 202 specimens collected, 42.6 % were infected with third-stage larvae of Contracaecum sp. in the body cavity. The intensity of the infection was 1-7 worms per fish (mean intensity = 2.2). Seasonal variation in the prevalence of the parasite was not obvious and there was no significant difference in the prevalence of infection between males and females (c2 = 2.228; P > 0.05). No significant relationship between host size and prevalence was established. There was also no significant relationship between intensity and the body condition factor (r = 0.11; P > 0.05). The low parasite prevalence may have been caused by the disruption of the infection cycle since piscivorous birds, which are the final hosts of the parasite, do not feed on C. gariepinus in Lake Chivero.

scholarly journals Condition factor of Goniopsis cruentata (Crustacea, Brachyura, Grapsidae) from Mundaú/Manguaba estuarine complex, Alagoas, Brazil

2012 ◽  
Vol 102 (3) ◽  
pp. 285-291 ◽  
Author(s):  
José J. P. R. Lira ◽  
Tereza C. S. Calado ◽  
Marina S. L. C. Araújo
Keyword(s):  
Condition Factor ◽  
Well Being ◽  
Northeast Brazil ◽  
Gonad Weight ◽  
Weight Relationship ◽  
Autumn And Winter ◽  
General Indicator

The condition factor is a parameter which acts as a general indicator of the "well-being" of a species, and it can be obtained through the analysis of width vs. weight relationships. The present work aims to investigate size vs. weight relationship and the condition factor of the crab Goniopsis cruentata (Latreille, 1803). The study area was the Mundaú/Manguaba estuarine complex, Maceió, state of Alagoas, Northeast Brazil. Samplings were monthly accomplished from August 2007 to July 2008. A total of 626 individuals were analyzed, being 309 males and 317 females. Males were larger and heavier than females, what is expected in many brachyuran. The growth was positive allometric to both males (b = 3.42) and females (b = 3.30), not obeying the "cube law". The condition factor of female was higher than that of male crabs, probably due to the gonad weight of females. It also varied seasonally for both sexes, being higher in the autumn and winter in males, and in the autumn and spring in females, and related to the molt and period of spawning intensification.

scholarly journals Observations on the age and growth of Varicorhinus damascinus (Val.) in Tigris river at Salahuldin province – Iraq

2008 ◽  
Vol 5 (2) ◽  
pp. 243-248
Author(s):  
Baghdad Science Journal
Keyword(s):  
Regression Coefficient ◽  
Age Groups ◽  
Age And Growth ◽  
Gill Nets ◽  
The Third ◽  
Weight Relationship ◽  
Tigris River ◽  
Straight Line ◽  
Males And Females ◽  
Relationship Of

Age and growth of Varicorhinus damascinus (Val.) in Tigris river at Salahuldin province have been investigated. Monthly samples were taken during the period from September 1999 to August 2000, using small-meshed gill nets. The age data showed that there were six age groups and the dominant age groups were (III – IV) for both sexes. The results of the present study revealed that the increment in length of V. damascinus at the sites of study showed a tendency to decrease with the increase in age, after the third year of life in both sexes. The length-weight relationship of males and females were calculated and demonstrated in a straight line logarithmic formula, as follows: Log W = 1.5404 + 2.6885 log L for males r = 0.95 (P > 0.05) Log W = 1.6723 + 2.7877 log L for females r = 0.77 (P > 0.05) The values of the regression coefficient (b) indicated that the growth of both sexes of V. damascinus was allometric..

scholarly journals An Exploration of Teachers' Perspectives towards Cognitive, Affective and Linguistic Teaching Principles while Teaching English as a Foreign Language

2021 ◽  
Vol 13 (1) ◽  
pp. 17-40
Keyword(s):  
Foreign Language ◽  
Teaching English ◽  
Male And Female ◽  
The Third ◽  
Teaching Principles ◽  
Efl Teachers ◽  
Cognitive Principles ◽  
Utmost Care ◽  
Males And Females ◽  
Teachers Perspectives

The study aimed at exploring EFL teachers' perspectives towards cognitive, affective and linguistic teaching principles while teaching English as a foreign language. To conduct the study, the researchers prepared a questionnaire of 30 items that was distributed into three group domains. The first group was the cognitive principles. The second one was the affective principles, and the third group was the linguistic principles. Forty-six male and female EFL teachers responded to the questionnaire's items. Suitable statistical analyses were used to analyze the data. The results of the study pointed out that EFL teachers had positive perspectives towards these teaching principles, as the analysis showed that they looked at these principles positively and they gave them their utmost care and concern. Besides, the analysis showed that the cognitive principles came in the first rank compared with the other two groups (affective and linguistic) as they got the highest mean. Moreover, the results revealed that there were no statistical significant differences, regarding gender, in the participants' perspectives towards the importance of these teaching principles while teaching English as a foreign language as the means of males and females were closer to each other. Keywords: Cognitive Principles, Affective Principles, Linguistic Principles, Foreign language.

scholarly journals Phytophagy of the predator Podisus nigrispinus (Dallas, 1851) (Hemiptera: Pentatomidae) fed on prey and Brassicaceae

2017 ◽  
Vol 77 (4) ◽  
pp. 703-709 ◽  
Author(s):  
J. F. J. Grigolli ◽  
M. M. Kubota Grigolli ◽  
D. G. Ramalho ◽  
A. L. Martins ◽  
A. M. Vacari ◽  
...  
Keyword(s):  
Generation Time ◽  
Reproductive Rate ◽  
Egg Mass ◽  
Reproductive Parameters ◽  
Net Reproductive Rate ◽  
Laboratory Rearing ◽  
Males And Females ◽  
The Mean ◽  
Heteroptera Pentatomidae ◽  
Alternative Diet

Abstract The purpose of this study was to investigate the development and reproduction of the zoophytophagous predator Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) fed kale, broccoli and cabbage affects its. Nymphs and adults of this predator were fed on larvae of Plutella xylostella (L.) (Lepidoptera: Plutellidae) as prey with kale, cabbage, or broccoli. In the nymph period, the duration and prey consumption were similar with all the Brassicacea cultivar. However, nymph viability was higher for predators with broccoli leaves. The mean weight of 5th-instar nymphs, newly emerged females and the sex ratio were similar among the Brassicacea cultivars, while newly emerged males were heavier with kale and broccoli leaves. The supply of broccoli leaves resulted in greater oviposition, higher number of eggs per egg mass and longer longevity of P. nigrispinus males and females. Furthermore, the consumption of P. xylostella larvae by adult predators was higher with these cultivars. The net reproductive rate (R0) and mean generation time (T) were highest for predators with prey and broccoli leaves. The reproductive parameters of P. nigrispinus were enhanced when fed on P. xylostella larvae with and broccoli leaves, which can be an alternative diet in laboratory rearing of this predator.

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