Scatter-spawning of the catfish,Silurus asotus

Katano, Osamu; Saitoh, Kenji; Koizumi, Akio

doi:10.1007/bf02905407

Cited by 15 publications

(33 citation statements)

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“…The mating behavior of Silurus asotus from Lake Biwa shoreside ricefields (Biwa population) observed in this study is very different from that of the same species from the Ooi River (Ooi population) reported by Katano et al (1988). The greatest difference is that the behavior of the Biwa population is basically conducted by a pair and shows a set sequence of actions whereas that of the Ooi population does not.…”

Section: Discussioncontrasting

confidence: 81%

Section: Resultsmentioning

confidence: 97%

“…It spawns at night in paddy fields during the rice planting and rainy seasons (Tomoda, 1962;Miyadi et al, 1976;Tomoda, 1978;Nakamura, 1984;Katano et al, 1988;Kobayakawa, 1989). Reproductive behavior of this catfish was recently described by Katano et al (1988) on the basis of field observations in the Ooi River system in Kyoto Prefecture. I observed the reproductive behavior of S. asotus in a ricefield system adjacent to Lake Biwa and noted significant differences from the findings of Katano et al (1988).…”

Section: Resultsmentioning

confidence: 97%

“…Reproductive behavior of this catfish was recently described by Katano et al (1988) on the basis of field observations in the Ooi River system in Kyoto Prefecture. I observed the reproductive behavior of S. asotus in a ricefield system adjacent to Lake Biwa and noted significant differences from the findings of Katano et al (1988). In this article, the mating behavior of this species from Lake Biwa is described in detail and compared with that of the same species from the Ooi River system.…”

Section: Resultsmentioning

confidence: 99%

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Stereotyped sequence of mating behavior in the Far Eastern catfish, Silurus asotus , from Lake Biwa

Maehata¹

2002

Ichthyological Research

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Mating behavior of the Far Eastern catfish, Silurus asotus (Siluriformes: Siluridae), was observed in a ricefield system facing the shore of Lake Biwa in mid-May to early June in 1990-1997. A set behavioral sequence similar to those of two other silurid fishes, S. biwaensis and S. lithophilus, both endemic to the Lake Biwa system, was observed: "chasing," "clinging," "enfolding" while "squeezing" by the male, and "circling" by the spawning pair. This form of mating behavior is quite different from that of S. asotus reported from the Ooi River system in Kyoto Prefecture, which mainly spawns in running water in ditches.

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Section: Discussioncontrasting

confidence: 81%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Stereotyped sequence of mating behavior in the Far Eastern catfish, Silurus asotus , from Lake Biwa

Maehata¹

2002

Ichthyological Research

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“…Accounts of the reproductive ecology of the latter two species have already been given (Katano et al, 1988;Katano, 1998;Maehata, 2001a). According to these reports, S. biwaensis gathers in great numbers (maximum number, 45 individuals in one night) and spawns on newly submerged, shallow rocky shores of Lake Biwa's outlet, the Seta River, on nights when the water level there is rapidly rising Maehata, 2001a), whereas S. asotus spawns at midnight in the irrigation ditches of ricefield areas, forming spawning groups of two to five individuals (Katano et al, 1988).…”

Section: Ichthyological Researchmentioning

confidence: 99%

Features of the reproductive ecology of the rock catfish Silurus lithophilus

Maehata

2002

Ichthyological Research

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Some aspects of the reproductive ecology of the rock catfish Silurus lithophilus (Siluriformes: Siluridae), a species endemic to the Lake Biwa system, were investigated from April to July in 1989-1994 observations were conducted at a rocky shoal, which was also a spawning ground of S. biwaensis, along the shore of the Seta River, the lake's outlet. Spawning of S. lithophilus occurred around midnight at shallow, rocky places on the shoal (5-70 cm in water depth) from early May to mid-July, starting earlier than S. biwaensis (mid-May to mid-July). Spawning tended to occur at low water temperatures irrespective of high-water events, unlike S. biwaensis, and in low densities (fewer than 8 fish per night) compared to S. biwaensis (1-45 fish per night). Although the rock catfish tended to appear and spawn at higher frequencies on nights when S. biwaensis spawned or appeared, it always avoided conflict with the latter species by spawning at sites far from those used by S. biwaensis or after S. biwaensis had left the vicinity. The survival of eggs of S. lithophilus might be favored by a strategy of diverting predator attention from them by synchronizing spawning nights with S. biwaensis.Key words Silurus lithophilus · Silurus biwaensis · Endemic species · Reproductive ecology · Rocky shoal this article, the features of the reproductive ecology of S. lithophilus are first analyzed on the basis of hydrographic variables and then discussed in relation to the appearance (including spawning) of S. biwaensis. Study Area and MethodsStudy area.-Observations were made along a rocky shore just upstream of the Nango Araizeki Weir across the Seta River in Otsu City, Shiga Prefecture (34°56Ј N, 135°55Ј E), where studied the reproductive behavior of Silurus biwaensis. A single 4-5 m wide, nearly flat, rocky shoal, consisting of stones 30-50 cm in diameter, extends about 200 m along the river's east bank. The shoal is usually exposed but becomes submerged when the water level is high. The water level rises not only after rainfall in the Lake Biwa basin, but also whenever the Nango Araizeki Weir is closed, with no relation to rainfall. Water flow over the shoal and its outer slope is negligible or very slow, less than 5 cm/s, when the shoal is submerged.Investigations.-The extent of submergence of the flat, rocky shoal (%), the numbers of individuals of S. lithophilus and S. biwaensis that appeared there, the spawning activity of these two species, and the depth of water in which S. lithophilus spawned were recorded at the site on 150 nights (usually from 2200 to 0600) from April to July in 1989July in -1994 Observations were mainly carried out from the river bank using a flashlight, covering an area of about 1000 m 2 around the shoal. The proportion of the shoal area that was sub- IchthyologicalResearch

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Biodiversity of Freshwater Fish in Japan in Relation to Inland Fisheries

Katano

Matsuzaki

2012

The Biodiversity Observation Network in the Asia-Pacific Region

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Scatter-spawning of the catfish,Silurus asotus

Cited by 15 publications

References 3 publications

Stereotyped sequence of mating behavior in the Far Eastern catfish, Silurus asotus , from Lake Biwa

Stereotyped sequence of mating behavior in the Far Eastern catfish, Silurus asotus , from Lake Biwa

Features of the reproductive ecology of the rock catfish Silurus lithophilus

Biodiversity of Freshwater Fish in Japan in Relation to Inland Fisheries

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