Spawning habit of Chaenogobius isaza TANAKA (Prelimiary report)

Kobayashi, Satoshi; Yamanaka, Yuichi; Torii, Ryo-Ichi

doi:10.2331/suisan.15.808

Cited by 8 publications

(4 citation statements)

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“…Isaza inhabits the offshore area and forages on zooplankton in the water column in Lake Biwa in seasons other than its breeding period, within 1 month from early or late April (Kobayashi et al 1950;Hidaka and Takahashi 1987). Breeding starts when the water temperature increases to over 10°C, and the annual variations in the start of reproduction probably depend on the variable water temperature.…”

Section: Study Speciesmentioning

confidence: 99%

“…We speculate that the low occurrence of filial cannibalism in Isaza is not only due to the low cost of paternal care for males but also to morphological traits in relation to feeding. Isaza is a pelagic fish and commonly forages on zooplankton in the water column (Kobayashi et al 1950;Hidaka and Takahashi 1987). It seems that the mouth morphology of Isaza is suitable for plankton feeding, and not appropriate to finely rogue surplus eggs without injury to the others.…”

Section: Relationship Between Brood Size and Brood Mortality Caused Bmentioning

confidence: 99%

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Why egg-caring males of Isaza (Gymnogobius isaza, Gobiidae) refuse additional females: preliminary field observations

Takahashi

Asada

Takeyama

et al. 2004

J Ethol

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Like many other gobies, males of the Isaza goby, Gymnogobius isaza endemic to Lake Biwa, Japan, conduct parental care of eggs at nests, and females are likely to choose mates while visiting nests. The reproductive strategy should induce polygyny, but Isaza males never accept additional females in one breeding cycle. Sampling data of broods indicated that the egg mass areas were much smaller than the nest sizes, suggesting that nest size is not the limiting factor in obtaining further eggs from additional females. The brood size greatly decreased as the duration of care progressed. Few individuals including caring males ate eggs, and heterospecific egg predators were rarely observed. Sixty percent of egg masses at the middle stages of egg development were infected with aquatic fungi, some being covered with a fungus mat that drastically reduced survivorship. Infected egg masses contained more eggs than non-infected ones at the same stage, indicating that large egg masses are prone to be frequently destroyed by fungi. It is likely that the activity of parental males is lowered during the long care periods at low water temperature in early spring. Such lowered activity of caring males might be responsible for infections in large broods that would have needed more care. We propose the hypothesis that male rejection of additional females may be related to optimal brood size, which will be less susceptible to fungus infection and produce more hatching young than otherwise. This hypothesis will explain not only male avoidance of additional females but also some unique reproductive behaviors of this fish such as some females' spawning of a portion of of the mature eggs in one nest.

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Section: Study Speciesmentioning

confidence: 99%

Section: Relationship Between Brood Size and Brood Mortality Caused Bmentioning

confidence: 99%

Why egg-caring males of Isaza (Gymnogobius isaza, Gobiidae) refuse additional females: preliminary field observations

Takahashi

Asada

Takeyama

et al. 2004

J Ethol

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“…Sources: 1, Akihito et al (2000a); 2, Ishino (1986); 3, Dotsu (1961b);4;Dotsu (1955a); 5, Kobayashi et al (1950); 6, Dotsu (1957b); 7, Dotsu (1989); 8, Dotsu (1954);9, Dotsu (1984); 10, Nakamura (1986) determines these two aspects of paedomorphic ontogeny with maturity. The availability of zooplankton as food for fish larvae in tropical environments is much more stable throughout the year than in temperate-cold waters in which it is low in winter (Cushing 1990).…”

Section: Table 4 Comparison Of Life Histories and Morphology Among Gmentioning

confidence: 99%

Diversity and evolution of life histories of gobioid fishes from the viewpoint of heterochrony

Kon¹,

Yoshino²

2002

Mar. Freshwater Res.

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The ontogenies of the gobioid fishes are matched against a framework of age-based heterochrony and their life-history strategies are discussed on the basis of published reports. Deceleration was observed in Leucopsarion, Crystallogobius and some species of Luciogobius from temperate or cold waters. Hypomorphosis was observed in Schindleria, Paedogobius and another species of Luciogobius, the former two genera maturing at one month or two after hatching throughout the year in tropical environments. Acceleration was observed in oxudercines, soft bottom-dwellers in intertidal areas and mangrove swamps, during larval and juvenile periods. Their acceleration, based on warm conditions allowing fast metamorphosis, may be an adaptation allowing immediate recruitment to a littoral life style. Hypermorphosis was observed in Acanthogobius flavimanus, which develops more slowly than other congeners. Isomorphosis by acceleration and hypomorphosis was observed during the larval and juvenile periods in fluvial Rhinogobius spp. and Acentrogobius viridipunctatus. This developmental shift, with truncation of the larval period, seems to be an important event among gobioid fishes, facilitating their survival in severe environments such as spates in rivers or on mudflats.

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“…The life history and maturation processes of Isaza were described by , 1952a, 1952b, , Nagoshi (1966Nagoshi ( , 1969, Takahashi (1974Takahashi ( , 1981aTakahashi ( , 1981b and Takahashi & Hidaka (1984). This species lives offshore in the lake almost throughout the year, showing a remarkable diel vertical migration from the lake bottom to near the surface.…”

mentioning

confidence: 99%

Reproductive strategy and interspecific competition in the Lake-living gobiid fish isaza,Chaenogobius isaza

Hidaka

Takahashi

1987

J. Ethol.

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Isaza, Chaenogobius isaza, is a small gobiid fish endemic to Lake Biwa. It lives offshore throughout almost the entire year, showing a remarkable diel vertical migration. In early spring, males and females migrate to lake shore to spawn under stones. Spawning season is limited to a very short span of time in early spring, late April to early May. During this short spawning season, the male is supposed to have only 2 brood cycles at maximum. At each brood cycle, the male is strictly monogynous, never accepting additional females. Males therefore show a marked mate choice, choosing a larger female regardless of the size of the male himself. Females also choose larger males. However, males are supposed to not waste time in male-male fighting in the natural spawning area. That this very short spawning season and its occurrence in early spring is primarily to avoid interspecffic competition with another littorally reproducing goby Yoshinobori, Rhinogobius brunneus, is experimentally demonstrated.Isaza, Chaenogobius isaza (Fig. 1), is a small

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Spawning habit of Chaenogobius isaza TANAKA (Prelimiary report)

Abstract: Chaenogobiuc isaza TANAKA, an endemic goby, is one of the important fish of Lake Biwaa and its annual catch ranks third among all fishes in that lake.

Cited by 8 publications

References 0 publications

Why egg-caring males of Isaza (Gymnogobius isaza, Gobiidae) refuse additional females: preliminary field observations

Why egg-caring males of Isaza (Gymnogobius isaza, Gobiidae) refuse additional females: preliminary field observations

Diversity and evolution of life histories of gobioid fishes from the viewpoint of heterochrony

Reproductive strategy and interspecific competition in the Lake-living gobiid fish isaza,Chaenogobius isaza

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