Growth performance of hybrid striped bass (Morone chrysops × M. saxatilis) fed with commercial pike perch and trout diets

Abstract

Two commercial trout diets (Oncorhynchus mykiss) and one commercial pike perch diet (Sander lucioperca) were fed to hybrid striped bass (Morone chrysops 9 M. saxatilis) (mean initial weight ± SD of 60.7 g ± 12.1; mean initial length SD of 17.2 cm ± 1.1) for 69 days at rations of approximately 1% average body weight. While final body weight (FBW), final length (FBL) and condition factor (Cf) were not significantly influenced by diets, specific growth rate (SGR) in hybrid striped bass fed with the pike perch diet (1.15) was significantly higher than those fed with either of the two trout diets (1.04 and 1.07). The feed conversion ratio (FCR) in hybrid striped bass fed with the pike perch diet (1.0) was significantly lower than the FCR in hybrid striped bass fed with either of the two trout diets (1.1 and 1.2). When hybrid striped bass (mean initial body weight: 65.7 ± 4.5 and 127.7 ± 2.9 g) were fed with the pike perch diet twice per day until satiation for 52 days, the SGR was 1.7 and 1.15% d -1 in fishes with an average body weight of 116 and 183 g, respectively. Present results demonstrate that growth performance in hybrid striped bass can be improved when fishes are fed with commercial pike perch diets rather than using commercial trout diets as is the current practice.

Morphological descriptions and morphometric discriminant function analysis reveal an additional four groups of Scylla spp

“…Although the number of crabs being classed as SH 3 and SH 4 were very low, their obvious morphological differences (Table 1) compared to others, i.e., S. olivacea, S. serrata, S. tranquebarica, S. paramamosain, SH 1 and SH 2, warrant them to be categorized into separate groups. The occurrence of hybrids, especially in crustaceans is not as common (Kim et al, 2012) as it is in other marine organisms such as fish (Bartley, Rena & Immink, 2000;Ende et al, 2018), and the report of one specimen of natural Scylla hybrid by Imai & Takeda (2005) in Japan further supports this postulate. However, it is important that the maternal and paternal inheritance of all four groups of SHs, including SH 3 and SH 4, should be tested using molecular methods to verify their hybrid status.…”

“…The offspring, known as hybrids, may have some or combined desirable characteristics of both parents (positive heterosis), which is the ultimate goal of hybridization. Some of the successful inter-specific hybridization examples include hybrid striped bass (Morone chrysops × M. saxatilis) with faster growth, better temperature tolerance, flexibility to environmental parameters, and stronger disease resistance compared to its parents (Kohler, 2004;Ende et al, 2018), and Splake, hybrid trout (Salvelinus namaycush × S. fontinalis) that is fertile, fast growth and tolerant to acid water (Snucins, 1993).…”