Flow field control for larviculture of the seven-band grouper Epinephelus septemfasciatus

Sakakura, Yoshitaka; Shiotani, Shigeaki; Chuda, Hisashi; Hagiwara, Atsushi

doi:10.1016/j.aquaculture.2007.04.042

Cited by 27 publications

(14 citation statements)

References 35 publications

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“…The seven‐band grouper Hyporthodus septemfasciatus (Craig & Hastings ) is a serranid fish and an ideal aquaculture candidate because of its high market value, scarcity in the wild, and rapid growth in temperate and tropical regions (Fukuhara ; Tucker ; Pierre, Gaillard, Prevot‐Dalvise, Aubert, Rostaing‐Capaillon, Leung‐Tack & Grillasca ). Techniques for fingerling production of the seven‐band grouper have been developed to promote the aquaculture of this species in several Japanese institutes (Tsuchihashi, Kuriyama, Kuromiya, Kashiwagi & Yoshioka , ; Tanaka, Sakakura, Chuda, Hagiwara & Yasumoto ; Sakakura, Shiotani, Chuda & Hagiwara , ; Teruya, Yoseda, Oka, Nishioka, Nakano, Mori, Sugaya & Hamasaki ). As a result, improved rearing techniques have increased larval survival and, at present, a single hatchery can produce more than 100 000 fingerlings in a season (Nagano, Hozawa, Fujiki, Yamada, Miyaki, Sakakura & Hagiwara ; Tsuji, Abe, Hanyuu, Kuriyama, Tsuchihashi, Tsumoto, Nigou, Kasuya, Katou, Kawamura, Okada, Uji & Sawada ).…”

Section: Introductionmentioning

confidence: 99%

“…Mucous cells in the larval epidermis secrete mucus via a physical stimulus and, when the larvae congregate at the water surface, they are bonded to the surface and each other by the mucus and, consequently, a mass of dead individuals accumulate at the water surface, which is termed larval water surface death (Yamaoka et al 2000). The control method of using oil is often used in seven-band grouper fingerling production (Tanaka et al 2005;Sakakura et al 2006Sakakura et al , 2007Nagano et al 2007;Tsuji et al 2014), because it improves survival in the prelarval stage (Tsuchihashi et al 2003). In this species, removal of the oily surface film for the improvement of larval swim bladder inflation is methodologically antagonistic to the prevention of water surface mortality and, therefore, incompatible.…”

Section: Introductionmentioning

confidence: 99%

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Promotion of initial swim bladder inflation and effect of initial inflation failure on skeletal malformation in cultured seven-band grouperHyporthodus septemfasciatus(Thunberg)

Tsuji¹,

Uji

Tsuchihashi³

et al. 2014

Aquac Res

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The effects of the removal of the oily surface film on initial swim bladder inflation and survival in cultured seven‐band grouper Hyporthodus septemfasciatus were investigated during the larval stage. Additionally, the relationship between swim bladder inflation failure and malformations in later stages was examined. To explore promotion conditions for inflation, duplicate experiments were conducted under three different water surface conditions: removal of the oily surface film (ROF group), covering the water surface with an oil film (COF group), and sealing the water surface with liquid paraffin (SLP group). Larval swim bladder inflation was first observed 14 days after hatching (DAH) in the ROF group; thereafter, swim bladder inflation rates increased to 11.1% and 38.7% until the end of the experiments. This indicates that initial swim bladder inflation occurs at the pre‐flexion stage in larval development. Conversely, bladder inflation was rarely observed in the COF or SLP groups, indicating the promotional effect of surface film removal on larval swim bladder inflation and suggesting that gulping atmospheric air is necessary for initial inflation. Although larval water surface death occurred frequently in the ROF group, no significant difference existed in any group between the survival rates at 10 DAH and at the end of the experiment. The incidence rate of spinal curvature and deformation of the centra was significantly higher in individuals without initial swim bladder inflation, and these malformations mainly occurred in the caudal vertebra. Therefore, the removal of the oily surface film promotes initial swim bladder inflation and reduces larval malformations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Promotion of initial swim bladder inflation and effect of initial inflation failure on skeletal malformation in cultured seven-band grouperHyporthodus septemfasciatus(Thunberg)

Tsuji¹,

Uji

Tsuchihashi³

et al. 2014

Aquac Res

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“…Comparing the very large tank employed by Sakakura et al to the cases in this study, the flow in the tank corresponds to the case shown in Fig. 4, in which a high survival rate for the larvae is not necessarily expected [5]- [6]. Therefore, in this case, a double vortex in the vertical direction, as for AR = 2.0, is not formed.…”

Section: Relevance Of Flow Patterns and Larviculturementioning

confidence: 99%

“…For example, the Nagasaki Prefectural Institute of Fisheries in Japan uses a cylindrical tank for fish rearing with a diameter of 8 m, a depth of 2 m, and a tank water capacity of 100 m 3 [5]- [6]. For this tank, the AR is 0.47.…”

Section: Relevance Of Flow Patterns and Larviculturementioning

confidence: 99%

Relationship between Aspect Ratio and Flow Fields in a Rearing Tank

Sumida

Shiotani

Yamazaki³

2015

J. Abmech

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Abstract-Aeration rates and tank geometry result in different larvae survival rates [1]-[6]. This study reports new results about the flow field in a rearing tank. Specifically, the effects of the aspect ratio AR (the ratio of water depth to tank radius) on overall flow fields were clarified from flow visualization and PIV (Particle Image Velocimetry) experiments. Two different types of flow patterns, a single-pair vortex system and twopair vortex system, were confirmed as the value of tank aspect ratio changed from 1.0 to 2.0.

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“…The seven‐band grouper, Epinephelus septemfasciatus (Thunberg), has recently become a target species for aquaculture in Japan because of its high commercial value. A number of studies have focused on methods to increase larval survival (Tsuchihashi, Kuriyama, Kuromoiya, Kashiwagi & Yoshioka ; Tanaka, Sakakura, Chuda, Hagiwara & Yasumoto ; Sakakura, Shiotani, Chuda & Hagiwara , ; Sakakura, Shiotani, Shiozaki & Hagiwara ; Teruya, Yoseda, Oka, Nishioka, Nakano, Mori, Sugaya & Hamasaki ). However, high levels of larval mortality are still considered to be a problem during juvenile production.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature, hypoxia and disinfection with ozonated seawater during somitogenesis on muscular development of the trunk in larval seven-band grouper,Epinephelus septemfasciatus(Thunberg)

et al. 2014

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The cause of abnormal musculature on both sides of the same myotome in artificially cultured seven‐band grouper Epinephelus septemfasciatus (Thunberg) larvae remains unclear. We evaluated the effect of three factors: changes in temperature (between 22 and 24°C), disinfection with ozonated seawater (0.3 mg TROs L−1, 1 min), and hypoxia (22 or 14% saturation) during the early (20 h post‐fertilization, hpf) and mid‐ (24 hpf) somite stages on trunk muscular development in larval seven‐band grouper. The thermal regimes and disinfection with ozonated seawater had no effect on muscle development (P > 0.05, G‐test). In contrast, exposure to hypoxia during both the early and mid‐somite stages increased the incidence of abnormal musculature in the trunk (P < 0.01, G‐test). These larvae had abnormal musculature on both sides of the trunk. In addition, the number of abnormal myotomes differed among these larvae. Exposure in the early and mid‐somite stages resulted in the highest frequency of abnormalities in the 11th and 13th myotome respectively. Our results suggest that hypoxia during somitogenesis can lead to abnormal muscle development in the trunk of artificially cultured seven‐band grouper larva.

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Flow field control for larviculture of the seven-band grouper Epinephelus septemfasciatus

Cited by 27 publications

References 35 publications

Promotion of initial swim bladder inflation and effect of initial inflation failure on skeletal malformation in cultured seven-band grouperHyporthodus septemfasciatus(Thunberg)

Promotion of initial swim bladder inflation and effect of initial inflation failure on skeletal malformation in cultured seven-band grouperHyporthodus septemfasciatus(Thunberg)

Relationship between Aspect Ratio and Flow Fields in a Rearing Tank

Effect of temperature, hypoxia and disinfection with ozonated seawater during somitogenesis on muscular development of the trunk in larval seven-band grouper,Epinephelus septemfasciatus(Thunberg)

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