Morphological development of the swim bladder in hatchery-reared striped trumpeter Latris lineata

Abstract

Summary This study examined swim bladder morphogenesis in three cohorts of striped trumpeter (Latris lineata), a euphysoclist species with physostomous larvae. The swim bladder was first discernible 1–2 days after hatching as an evagination on the dorsal surface of the incipient digestive tract. It comprised a cluster of mesenchymal cells surrounding an inner primordium of epithelial cells. At mouth opening in larvae of 5.3 mm standard length (SL), the swim bladder was noticeably enlarged. Histologically, the swim bladder lumen was dilated and liquid filled. The pneumatic duct was first seen during the dilation stage and the rete mirabile began forming among the connective tissue surrounding the swim bladder. Initial swim bladder inflation occurred on day 11 post‐hatching in Cohort 1, at 14°C, and day 9 post‐hatching, in Cohorts 2 and 3, at 16°C. Histologically, the lumens of inflated swim bladders were ellipsoid and the epithelium was squamous, except for cuboidal gas gland cells at the anterio‐ventral and anterio‐lateral regions of the swim bladder. During the initial inflation interval the pneumatic duct was dilated in larvae both with and without swim bladder inflation. The pneumatic duct began to regress in some larvae over 7.5 mm SL. The swim bladder of striped trumpeter was similar to larvae of other altricial perciform marine fish in respect to organ derivation, tissue differentiation, luminal dilation and initial gaseous inflation. However, variations, particularly the delay in initial swim bladder inflation until after the start of feeding, were observed that could be fundamental to problems encountered during larval rearing.

Characterization of swim bladder non‐inflation (SBN) in angelfish, Pterophyllum scalare (Schultz), and the effect of exposure to methylene blue

“…The general growth in size and shape of the primordial swim bladder in angelfish, prior to inflation, its location and the development of the surrounding connective tissue resembles that of other perciform species (McEwen 1940; Johnston 1953; Doroshev & Cornacchia 1979; Morrison, Miyaka & Wright 2001; Trotter et al. 2004).…”

“…2004). However, in most fish species studied, the swim bladder develops as a simple out‐pocketing of the alimentary canal (McEwen 1940; Johnston 1953; Steen 1970; Boulhic & Gabaudan 1992; Govoni & Hoss 2001; Trotter et al. 2004).…”

“…Most larvae inflate their swim bladder early on, at a developmental stage coinciding with the depletion of yolk reserves and the initiation of external feeding (Tait 1960; Doroshev & Cornacchia 1979; Battaglene & Talbot 1990). In most studied species, the swim bladder develops as a simple evagination of the alimentary canal (McEwen 1940; Johnston 1953; Steen 1970; Boulhic & Gabaudan 1992; Govoni & Hoss 2001; Trotter, Pankhurst & Battaglene 2004). Physostomes retain to maturity a connection between the swim bladder and the digestive tract by means of a pneumatic duct, while physoclists have no such connection (Steen 1970).…”

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“…Majority of larvae swell their swim bladders in developmental stage corresponding to the time of absorption of yolk sacs and onset of exogenous feeding (Doroshev and Cornacchia 1979;Battaglene and Talbot 1990). In many analyzed species, swim bladder forms by a simple metamorphosis of alimentary canal (Boulhic and Gabaudan 1992;Govoni and Hoss 2001;Trotter et al, 2004).…”

“…There are two types of swim bladders which are physostomous and physoclistous (Moyle and Cech 2000;Trotter et al, 2004;Govoni and Forward 2008). In physostomoes, there is a connection between digestive tract consisting of the swim bladder and pneumatic tube.…”