Changes in body composition associated with growth and reproduction in<i>Galeichthys feliceps</i>(Teleostei: Ariidae)

Marais, J.F.K.; Venter, D. J. L.

doi:10.2989/02577619109504628

Cited by 12 publications

(8 citation statements)

References 5 publications

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“…On the other hand, during the summer period, both the prey availability for chub and the energy content of its diet decrease in Iberian streams (Rodriguez-Jimenez, 1987;Magalhaes, 1993a,b;Encina, 1991), so probably food intake is not enough to maintain metabolic needs and must be accompanied by somatic energy depletion. The major decline in caloric content of the body tissues in adult fish (mainly in females) could be due to an effect of the post-reproductive stress, similar to that reported by Pierce & Wissing (1981), Fonds et al (unpublished), and Marais & Venter (1991) among others.…”

Section: Discussionsupporting

confidence: 84%

“…(Kelso, 1973;Bulow et al, 1978;Medford & MacKay, 1978;Dabrowski, 1985;Flath & Diana, 1985;Dygert, 1990). There exists a close general relationship between the variations in the physiological status of a fish and its body composition, condition, nutrition, reproductive stage and energy content of the tissues (Craig, 1977;Marais & Erasmus, 1977;Adams et al, 1982;Marais & Venter, 1991;Rajasilta, 1992). The importance of these changes in growth, reproduction and life-history studies has long been accepted (Brett et al, 1969;Hopkirk et al, 1975;Pekkarinen, 1980;Wootton et al, 1980;Paul et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal variations in the physiological status and energy content of somatic and reproductive tissues of chub

Encina¹,

Granado‐Lorencio²

1997

Journal of Fish Biology

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The seasonal fluctuations in condition, nutrition and somatic energy content, and gonad development cycle were investigated in chub Leuciscus pyrenaicus from the headwaters of the Guadalete River, a freshwater ecosystem characterized by strong seasonal fluctuations in discharge and water level, temperature and food supply. The relationship between somatic stage and gonad cycle was also investigated and discussed. Condition, nutrition and somatic energy cycles could be divided into two distinct periods: from April to January with summer decreases and autumn increments, which is common for juveniles and mature fish; and from January to March, when juveniles and mature fish displayed different temporal variations related to the reproductive cycle. Gonad development took place from the end of the winter into the summer, the testes developing before the ovaries. Spawning started in late spring (May) and continued into summer (June and July), with fish quiescent by autumn (September). The results suggest that, for L. pyrenaicus, both environmental factors (e.g. food supply, water temperature) and reproduction needs affect the condition, nutrition and somatic energy storage of fish, which have been used as indicators of the physiological status of the population. 1997 The Fisheries Society of the British Isles

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Section: Discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Seasonal variations in the physiological status and energy content of somatic and reproductive tissues of chub

Encina¹,

Granado‐Lorencio²

1997

Journal of Fish Biology

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“…Further, while some eggs were found in the mouths of a few specimens, as with previous studies (e.g. Rimmer, 1985b;Marais and Venter, 1991 No visible oocytes.…”

Section: Malessupporting

confidence: 78%

“…Further, while some eggs were found in the mouths of a few specimens, as with previous studies (e.g. Rimmer, 1985b; Marais and Venter, 1991), it was not possible to determine what proportions were released or swallowed during capture. The GSI of males significantly varied over time (Kruskal–Wallis H = 17.34, P < 0.01) peaking between summer and autumn (December–May; Fig.…”

Section: Resultsmentioning

confidence: 80%

Reproduction in Bagre marinus (Ariidae) off Pernambuco, northeastern Brazil

et al. 2006

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Throughout 1997, the catches of artisanal gillnetters working off the coast of northeastern Brazil were sampled monthly for Bagre marinus (Mitchill 1815). Significantly more females (n ¼ 207) than males (n ¼ 82) were caught, although there was no significant difference in their size compositions (21-47 cm fork length, FL). All males sampled (21-40 cm FL) had developed gonads and were classified as sexually mature. According to macroscopic and microscopic examination of their reproductive tract, females were separated into four reproductive stages (immature, maturing, mature, and resting). Size at 50% sexual maturity for females was estimated to be 33 cm FL. A positive linear relationship was detected between the size of mature females and their fecundity (between 11 and 32 oocytes). Clear reproductive progress indicated a spawning period between March and May. We conclude that further fishery-independent data are required to determine patterns of male abundances and distributions.

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“…Although the I GM for male A. pacificus also peaked in July and August, the pattern was much less marked than for females, with males exuding milt found in May well before the peak of ovarian development. The cost of reproduction is lower for males (Chellappa et al ., 1989; Marais & Venter, 1991; van Rooij et al ., 1995) so elaboration of large testes outside the time of major female reproductive activity suggests that the trade‐offs between growth and reproduction are less critical, or at least different for males. The presence of female fish with increased I GM in May 1995 suggests that some females become reproductively active outside the main spawning period.…”

Section: Discussionmentioning

confidence: 99%

Reproductive periodicity of the sparid, Acanthopagrus pacificus, on a hierarchy of temporal scales

Sheaves

Molony

2013

Journal of Fish Biology

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The reproductive periodicity of the sparid, Acanthopagrus pacificus, over four temporal scales is described. Acanthopagrus pacificus had a short spawning season between June and September, and within this, a peak reproductive period from July to early September. During the peak period there were several spawning peaks corresponding to a lunar periodicity, with intense reproductive activity on new and full moons that peaked during the period of the full moon when the tidal range was greatest. At the smallest temporal scale, spawning occurred at night on ebb tides. Because this study draws on data collected in 1991 and 1995, it provides a useful baseline against which to judge future changes in reproductive periodicity.

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Changes in body composition associated with growth and reproduction inGaleichthys feliceps(Teleostei: Ariidae)

Cited by 12 publications

References 5 publications

Seasonal variations in the physiological status and energy content of somatic and reproductive tissues of chub

Seasonal variations in the physiological status and energy content of somatic and reproductive tissues of chub

Reproduction in Bagre marinus (Ariidae) off Pernambuco, northeastern Brazil

Reproductive periodicity of the sparid, Acanthopagrus pacificus, on a hierarchy of temporal scales

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