Reproductive biology of ningu, Labeo victorianus (Pisces : Cyprinidae), in the Kagera and Sio Rivers, Uganda

Rutaisire, J.; Booth, Anthony J.

doi:10.1007/s10641-004-5564-8

Cited by 23 publications

(19 citation statements)

References 29 publications

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“…This author observed that higher values of the GSI predominated in the species that were total spawners, whereas the lower and intermediate values were more frequent in the fishes that were multiple spawners. Nevertheless, in spite of the lack of monthly samples to establish the picture frequently adopted to describe the fishes' reproductive period (Garutti, 1989;Goulart, 1994;Vazzoler, 1996;Hotos et al, 2000;Rutaisire and Booth, 2005;Vallisneris et al, 2006;Hardie et al, 2007;Allison et al, 2008), the higher frequency of mature specimens with a high GSI in August and September (short dry season) was evidence for more intensive spawning activities in these months.…”

Section: Discussionmentioning

confidence: 99%

Reproductive biology ofChromidotilapia guntheri(Sauvage, 1882) (Cichlidae, Perciformes) in four coastal rivers (Ehania, Noé, Soumié and Eholié) of Côte d’Ivoire in West Africa

Boussou

Edia

Konan

et al. 2010

Knowl. Managt. Aquatic Ecosyst.

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Key-words:spawning activities, Chromidotilapia guntheri, Ivorian coastal streamsThe reproductive activities of a small Cichlid Chromidotilapia guntheri were investigated from July 2003 to March 2005 in four coastal rivers (Ehania, Eholié, Noé and Soumié), in the southeast of Côte d'Ivoire. Trends in gonadosomatic indices and reproductive stages of development suggested that C. guntheri is a multiple (fractional) spawner and breeds all year round with little fluctuation in spawning intensity. However, spawning activities were more intensive in August and September. The estimated mean standard length at first maturity did not differ significantly between rivers. It was, in the overall population, 85.53 mm SL for males and 100.13 mm SL for females. In general, the sex ratio differed from 1:1 with the predominance of the males in rivers, standard length classes, seasons and the entire population. Absolute fecundity (F) varied from a minimum of 70 to a maximum of 470 eggs. The range of variation in the relative fecundity was from 3066 to 9135 eggs per kilogram of fish in the total population. Fecundity did not differ extensively between rivers. The absolute fecundity relations to fish standard length (SL) and eviscerated weight (We) were best described in the whole population by the following equations: F = 0.00069 × SL 2.72 and F = 2.54 × We 1.15 , respectively. Moreover, there was no relationship between absolute fecundity and oocyte diameter. a varié de 70 à 470 ovocytes dans toute la population et n'a présenté aucune différence significative entre les rivières. Les relations fécondité absolue (F)-longueur standard (LS) et fécondité absolue-poids éviscéré (We) ont été mieux décrites respectivement par les équations suivantes : F = 0,00069 × LS 2,72 et F = 2,54 × We 1,15 . En outre, il n'est apparu aucune relation entre la fécondité absolue et les diamètres ovocytaires.

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Section: Discussionmentioning

confidence: 99%

Reproductive biology ofChromidotilapia guntheri(Sauvage, 1882) (Cichlidae, Perciformes) in four coastal rivers (Ehania, Noé, Soumié and Eholié) of Côte d’Ivoire in West Africa

Boussou

Edia

Konan

et al. 2010

Knowl. Managt. Aquatic Ecosyst.

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“…The logistic parameters were estimated by nonlinear minimization of a negative binomial loglikelihood of the form (Maartens and Booth 2005;Rutaisire and Booth 2005) …”

Section: Length At Sexual Maturitymentioning

confidence: 99%

Reproductive biology of Bigeye Tuna, Thunnus obesus, (Scombridae) in the eastern and central tropical Pacific Ocean

Zhu

Dai

et al. 2010

Environ Biol Fish

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Understanding the reproductive potential of any species is of great importance for resource assessment and management. We studied the reproductive biology of Bigeye Tuna, Thunnus obesus, based on 1283 samples taken from the Chinese longline vessels in the eastern and central Tropical Pacific Ocean during February through November 2006. The female-male ratio was 1.0 : 1.5 and males were predominant in all length classes except for the length class of 166-170 cm (fork length). Males dominated in sizes larger than 171 cm, all specimens of 192 cm or larger were males. The main spawning period of Bigeye Tuna was between March and November. Gonadosomatic rates of males were larger than those of females. Statistically, female and male Bigeye Tuna had no significant reproductive seasonality. The observed minimum length at sexual maturity for female Bigeye Tuna was 94 cm. Length at 50% sexual maturity of female Bigeye Tuna was estimated at 107.8 cm, and maturation rate was 0.106 cm −1 . The results derived in this study provide the information critical to our understanding of key life history parameters of Bigeye Tuna in tropic Pacific Ocean.

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“…In this case, parameter G equals 1. The logistic parameters were estimated by the non-linear minimization of a negative binomial log-likelihood of the form (Maartens and Booth, 2005;Rutaisire and Booth, 2005) ln ln ln (1 ) 1…”

Section: Length At 50% Maturity (L 50 )mentioning

confidence: 99%

Reproductive biology of yellowfin tuna T. albacares in the west-central Indian Ocean

Zhu

Zhou

et al. 2008

J. Ocean Univ. China

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Survey of yellowfin tuna in the west-central Indian Ocean was conducted on board of Chinese longliners during 2003, 2004 and 2005, which is a part of Chinese Tuna Fishery Scientific Observer Program (CTFSOP).The reproductive biology has been investigated. A total of 1 023 samples are collected including 417 ovaries and 606 testes. Spawning activities of yellowfin tuna have been studied for both male and female from January to June. The data showed that the average monthly sex ratio is 0.59, and the minimum length at sexual maturity is 101 cm for female and 110 cm for male respectively. Length at 50% sexual maturity is estimated at 113.77 cm for female and 120.20 cm for male, whereas maturation rate is 0.066 cm -1 for female and 0.091 cm -1 for male. Sex ratio by length class indicates that the proportion of male is higher than female's along with size increasing; for instance, in the group of the body length longer than 145 cm, some females have their body length from 145 to 160 cm and males have their body length at 160 cm and even longer. Statistically, yellowfin tuna has a significant seasonal reproduction.

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Reproductive biology of ningu, Labeo victorianus (Pisces : Cyprinidae), in the Kagera and Sio Rivers, Uganda

Cited by 23 publications

References 29 publications

Reproductive biology ofChromidotilapia guntheri(Sauvage, 1882) (Cichlidae, Perciformes) in four coastal rivers (Ehania, Noé, Soumié and Eholié) of Côte d’Ivoire in West Africa

Reproductive biology ofChromidotilapia guntheri(Sauvage, 1882) (Cichlidae, Perciformes) in four coastal rivers (Ehania, Noé, Soumié and Eholié) of Côte d’Ivoire in West Africa

Reproductive biology of Bigeye Tuna, Thunnus obesus, (Scombridae) in the eastern and central tropical Pacific Ocean

Reproductive biology of yellowfin tuna T. albacares in the west-central Indian Ocean

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