Reproductive Strategies in the Stone Loach Noemacheilus barbatulus

Mills, C. A.; Eloranta, Anssi

doi:10.2307/3544709

Cited by 52 publications

(47 citation statements)

References 8 publications

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“…Relative investment in gonadal tissue (RAI) of firsttime spawners the year of maturation was expressed as wet weight and as energy ratios, and estimated according to Mills & Eloranta (1985):…”

Section: Methodsmentioning

confidence: 99%

Energy allocation in polymorphic Brown Trout

Jönsson

1997

Functional Ecology

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1. To evaluate differences in energy allocation to gonadal development of resident and anadromous Brown Trout, Salmo trutta, we analysed tissue composition and energy contents of adults of the two morphs from three small streams in southernmost Norway. Somatic energy per unit mass of anadromous spawners (5·0 ± 0·6 kJ g–1 wet weight) was 1·1 times that of the residents. This difference was chiefly due to a 1·4 ‐times higher lipid content in anadromous (4·9 ± 1·5%) than resident trout. The somatic protein and carbohydrate contents per unit mass were higher in resident than anadromous fish. 2. Somatic energy content per unit mass increased linearly with body length in resident but not anadromous fish. This increase was due to a significant increase in lipid content with fish size in resident contrary to anadromous trout. 3. The mass‐specific energy content of the ovaries was higher for residents (8·4 ± 0·4 kJ g–1 wet weight) than anadromous (7·81 ± 0·5 kJ g–1 wet weight) trout. This was due to higher lipid and protein contents per unit mass in resident than anadromous females. In males, no similar differences between morphs were found (5·9 ± 0·8 kJ g–1 wet weight). The mass‐specific energy content of the ovaries was c. 1·4 higher than that of the testes, mainly caused by a 2·3–2·6 higher lipid content per unit mass of eggs. 4. The mean gonadosomatic index (kJ %) was higher in anadromous (34·0 ± 9·4) than resident (28·6 ± 5·5) females, but not in males (≈ 3%). In females, but not in males, gonadal energy increased linearly with increasing somatic energy of the fish. 5. Female gonadal energy at corresponding somatic energies was higher than that of males. On average, the energetic investment in gonads relative to soma of first‐time spawners in the year of maturation was estimated at 11% in males and 67% in females.

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Section: Methodsmentioning

confidence: 99%

Energy allocation in polymorphic Brown Trout

Jönsson

1997

Functional Ecology

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“…Gonadosomatic indexes (GSZ) of females were estimated as ovarian weight (OW, g) on somatic weight (SW, g): GSZ= OWloo/SW, where:SW = W -OW. Relative annual investment in reproduction @AZ) of females was estimated as ovarian weight over ovarian weight plus annual increase in somatic weight (ZSW): RAZ= OW/(OW + ZSW) (Mills & Eloranta 1985). The estimation is based on mean wet weights and percentages of mature and immature females in the various age-groups.…”

Section: Methodsmentioning

confidence: 99%

Downstream displacement and life-history traits of whitefish,Coregonus lavaretus, in a Norwegian river

Jönsson

Ruud-Hansen

1988

Environ Biol Fish

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SynopsisEach year from 1976 to 1985 a part of the freshwater resident whitefish, Coregonus lavaretus, in Liavatn, south-western Norway, was displaced downstreams into the sea. In the sea, they seemed to die within a short period of time. The fish appeared to be flushed downstream by autumn freshets. In age and size, but not sex, the descenders seem representative of the fish in the lake. Females were the predominant sex in the river, whereas the sex ratio did not differ from unity in the lake. Young fish were fast-growing, but the growth rate levelled off at an age of 2 years and an asymptotic length of -30 cm. Males matured mainly at age l+ and females at age 2+. The gonadosomatic index decreased with age, whereas the amount of energy allocated to gonadal tissue relative to somatic tissue increased with age.

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“…All these species have a wide distribution in Europe and can be found in an array of different habitats and environmental conditions (Smyly, 1955;1957;Mills et al, 1983;Mills & Eloranta, 1985;Gaudin & Cailliere, 1990;Doadrio et al, 1991;Lobon-Cerviá et al, 1991, Rundle & Hildrew, 1992Degerman & Sers, 1993). This indicates that from an evolutionary point of view, these species have developed few habitat adaptations and display an opportunistic behaviour in habitat selection as in other life-history aspects, such as fecundity or lifespan (Maitland, 1965;Mann et al, 1985, Angermeier, 1987.…”

Section: Discussionmentioning

confidence: 99%

Habitat use by the fish assemblages of two chalk streams

Prenda

Armitage

Grayston

1997

Journal of Fish Biology

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Patterns of habitat use by fish assemblages in two chalk streams in southern England were examined to identify species preferences with respect to major habitat gradients. Both study sites although differing in some physical habitat characteristics, mainly channel width, water temperature and instream cover, could be similarly arranged along a continuum extending from erosional to depositional habitats. Twelve fish species were collected from stream surveys conducted during July 1993. The habitat was partitioned into six fish species associations that could be assigned to three habitat guilds: depositional (Barbatula barbatula, Gasterosteus aculeatus and Anguilla anguilla), riffle (Leuciscus leuciscus, Thymallus thymallus and Salmo salar) and generalist (Salmo trutta, Phoxinus phoxinus, Gobio gobio, Cottus gobio, Lampetra planeri and Pleuronectes flesus).At low to moderate densities the different species associations were collected in the same habitat patch, but at higher densities there was a clear tendency to mutual avoidance. In particular, large trout appeared as strong interactors that tended to exclude other species from their territories. We hypothesize that the fish assemblage of the Mill Stream and Bere Stream have partitioned the habitat in such a way as to minimize potential competition.

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Reproductive Strategies in the Stone Loach Noemacheilus barbatulus

Cited by 52 publications

References 8 publications

Energy allocation in polymorphic Brown Trout

Energy allocation in polymorphic Brown Trout

Downstream displacement and life-history traits of whitefish,Coregonus lavaretus, in a Norwegian river

Habitat use by the fish assemblages of two chalk streams

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