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gonad maturation

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Journal Article
Aquatic Ecosystem Health & Management (2010) 13 (1): 11–19.
Published: 26 February 2010
... and state of gonad maturity estimated macroscopically. Minimum and maximum sizes in catches ranged from 10 to 100 mm total length in A. burtoni and from 20 to 180 mm in O. niloticus . Sizes at first maturation were 65 mm total length for female and 70 mm for male in A. burtoni and 130 mm in O. niloticus...
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Journal Article
Aquatic Ecosystem Health & Management (2010) 13 (2): 214–221.
Published: 28 May 2010
... 0.5 inch to 3 inch and a beach seine of mesh size 1 inch. Six gonad maturity stages have been described visually, based on morphological features, and validated by histological features of the ovary, as well as examination of the oocyte diameter. Females dominate the population at all sizes classes...
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Journal Article
Aquatic Ecosystem Health & Management (2014) 17 (1): 90–96.
Published: 02 January 2014
... and maturity stage, number of parasites , gonad assessment and egg count. Number, length and total weight of L. intestinalis found per fish host were recorded. The average infestation rate from the two landing sites (Matema and Kafyofyo) was 32.5%. Kafyofyo had the highest infestation rate (50%) and Matema (15...
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Journal Article
Aquatic Ecosystem Health & Management (2007) 10 (4): 443–448.
Published: 28 November 2007
... frequency distribution of intra-ovarian oocytes was determined by measuring the diameter of oocytes contained in a cross section taken from the central part of the right and left lobes of the ovary earlier preserved in Gilson's fixative. The mean ova diameter of mature gonads and fecundity were compared...
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Journal Article
Aquatic Ecosystem Health & Management (2021) 24 (2): 130–139.
Published: 01 April 2021
... the beginning of the experiments. For the beginning of the experimental phase in September 2019, when the fish began a new cycle of gonadal maturation, the fish were transferred to tanks conditioned with a biofloc system using clean water from the CINPIC water distribution system, where the execution...
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Journal Article
Aquatic Ecosystem Health & Management (2001) 4 (3): 275–282.
Published: 01 September 2001
.... In the study of roach from Lake Funbosjön, intersex occurred in 70% of the examined individuals. In all intersex individuals, the gonads were dominated by testicular tissue with non- mature oocytes dispersed in the parenchyma (Fig.1). A high incidence of intersex in roach has also been observed in English...
Journal Article
Aquatic Ecosystem Health & Management (2018) 21 (2): 152–158.
Published: 03 April 2018
... Arm of Lake Malaŵi. Breeding seasonality was analyzed on the basis of monthly variation of gonado-somatic index and gonadal appearance, while sexual maturity was determined by fitting the logistic model to the proportions of sexually mature individuals. Length frequency data were used to characterize...
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Journal Article
Aquatic Ecosystem Health & Management (2014) 17 (1): 41–51.
Published: 02 January 2014
... habitats were the largest in size ( Figures 3a and b ), apparently because the usual fishing gear used in this habitat was gillnet which had the largest mesh size ( Figure 3c ) and was more selective. So, many rocky shore fishes were therefore caught as adults with mature gonads ( Figure 3c ) of present...
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Journal Article
Aquatic Ecosystem Health & Management (2013) 16 (3): 322–328.
Published: 01 July 2013
...% formaldehyde. In the laboratory, samples were measured individually to the nearest mm below (standard length, SL) and weighed to the nearest gram below. The same was done for samples collected from artisanal fishers. Sampled fishes were dissected to examine sex, fecundity and gonadal maturity stages (coded...
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Journal Article
Aquatic Ecosystem Health & Management (2012) 15 (3): 311–315.
Published: 01 July 2012
... (Grignard et al., 1996 ). In the Gulf of Suez, gametogenesis begins in April–May, when the water temperature rises above 25°C and spawning takes place between June and September (Pearse, 1970 ). Sea Urchins are used as raw material to produce foodstuff; in particular, the product of processing gonads...
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Journal Article
Aquatic Ecosystem Health & Management (1999) 2 (3): 311–317.
Published: 01 January 1999
... , N.G. , Montin , G. and Plöen , L. 1985 . Kinetics of di-(2-ethylhexyl) phthalate in immature and mature rats and effect on testis . Acta Pharmacol. Toxicol. , 56 : 30 – 37 . Thomas , P. 1989 . Effects of Aroclor 1254 and cadmium on reproductive endocrine function...
Journal Article
Aquatic Ecosystem Health & Management (2003) 6 (3): 325–336.
Published: 01 September 2003
...; Nagelkerke et al., 1994; Mina et al., 1996; Nagelkerke and Sibbing, 2000; Sibbing and Nagelkerke, 2001), many questions on their repro- ductive biology are still not answered. Detailed infor- mation on gonad development, size at maturity, spawn- ing area, and spawning period of each of the 15 species...
Journal Article
Aquatic Ecosystem Health & Management (2009) 12 (1): 23–28.
Published: 09 March 2009
..., with the exception of the 38 mm mesh panel, which was 25 m in length. Two net gangs were set overnight, fishing approximately 24 hours within each of the randomly selected grid squares. Lake whitefish were sampled for total length (mm), fork length (mm), weight (g), sex, maturity, gonad condition, lamprey wounds...
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Journal Article
Aquatic Ecosystem Health & Management (2017) 20 (1-2): 130–139.
Published: 03 April 2017
... and juveniles caught through the bag nets were collected to incorporate every size group in the samples. Fortnightly sampling with coverage of full moon and new moon phases were followed. Experimental fishing was done through gill nets. Indigenous knowledge on fish growth, breeding, maturity, and seed...
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Journal Article
Aquatic Ecosystem Health & Management (2007) 10 (4): 449–457.
Published: 28 November 2007
... patterns in the length and age at maturity (Lm 50 ). Individual gonads were removed and sex and maturity status determined based on the Hopson's classification (1972). A total of 283,323 fish were measured during fisheries independent surveys between March, 1999 and July, 2000, and 13,507 fish...
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Journal Article
Aquatic Ecosystem Health & Management (2021) 24 (2): 52–63.
Published: 01 April 2021
...Archisman Ray; Canciyal Johnson; Ranjan Kumar Manna; Raju Baitha; Subhadeep Das Gupta; Nitish Kumar Tiwari; Himanshu Sekhar Swain; Basanta Kumar Das Abstract The catch pattern of the exotic Common Carp ( Cyprinus carpio ) and their relationship with water quality along with maturity status...
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Journal Article
Aquatic Ecosystem Health & Management (2013) 16 (4): 415–424.
Published: 01 October 2013
... glands which aid the maturation of the gonads of IMC. The study conducted from 2005 to 2009 found several species of fish in the upper cooler stretch of the River Ganga from Deoprayag to Haridwar that had not been recorded previously from this stretch but previously found in the middle warmer...
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Journal Article
Aquatic Ecosystem Health & Management (2002) 5 (4): 423–434.
Published: 01 December 2002
... in the aquatic environment is the induction of vitellogenin synthesis inmale or juvenile Ž sh (Sumpter and Jobling, 1995; Sherry et al., 1999). In Ž sh, vitellogenin is pro- duced under the control of estradiol in the liver of sex- ually maturing females and transported by the blood to the ovary, taken up...
Journal Article
Aquatic Ecosystem Health & Management (2009) 12 (2): 138–151.
Published: 27 May 2009
... stimulate the endocrine glands which help in the maturation of the gonads of Indian major carp. In West Bengal the average temperature is on the rise over the last 60 years. The average minimum and maximum temperature throughout the state has increased in the range of 0.1 to 0.9°C and rainfall pattern has...
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Journal Article
Aquatic Ecosystem Health & Management (2015) 18 (2): 160–170.
Published: 03 April 2015
... populations. Some were recorded only once after the introduction. Several attempts were made to acclimatize Stellate Sturgeon ( Acipenser stellatus Pallas, 1771) in the Aral Sea between 1933 and 1975. Despite the release of millions of fingerlings, fertile eggs and mature fish, all attempts failed...
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