Pinfish, Lagodon rhomboides, and pigfish, Orthopristis chrysoptera, are popular marine baitifsh used throughout the southeastern United States. Well‐defined methods exist for closing their life cycles in captivity and are being used for commercial aquaculture efforts for each species. Multiple spawning hormones have been effective for spawning induction for both species. Evaluations of a type II gonadotropin‐releasing hormone (cGnRH IIa) have proven it effective for induced spawning in channel catfish, and it has been proposed to be an effective hormone for induced spawning in other species. Four dosages (25, 50, 100 and 200 μg/kg) of cGnRH IIa for spawning induction along with a negative (saline at 0.5 ml/kg) and positive control (Ovaprim^® at 0.5 ml/kg) treatment were evaluated for both species. Pinfish and pigfish responded to every cGnRH IIa tested, with up to nine viable spawns collected from pigfish at 100 μg/kg and up to five viable spawns collected from pinfish at 200 μg/kg. The amount of sinking eggs spawned, egg and larval size, and hatching success and survival to first feeding differed significantly for pigfish. Total egg production, fecundity, egg and larval size, and hatching success and survival to first feeding were significantly different for pinfish. While effective for spawning induction in both species, there may be some decrease in spawn quality associated with cGnRH IIa, at least for pigfish. Future research directed towards understanding the potency and physiological reactions caused by cGnRH IIa will help corroborate findings of higher egg output and reduced egg and larval quality.

中文翻译：

---

不同剂量的cGnRH IIa对斑鱼和猪鱼产卵性能的影响

fish鱼（Lagodon rhomboides）和猪鱼（Orthopristis chrysoptera）是在美国东南部广泛使用的海鱼。存在明确的方法来封闭圈养的生命周期，并且被用于每个物种的商业水产养殖。多种产卵激素对于两种物种的产卵诱导都是有效的。对II型促性腺激素释放激素（cGnRH IIa）的评估已证明它对河channel鱼的诱导产卵有效，并且已被提议为对其他物种的诱导产卵有效的激素。四个剂量（25，50，100和200微克/千克）cGnRH IIA的用于（以0.5ml / kg的盐水）具有负沿产卵诱导和阳性对照（Ovaprim ^®以0.5ml / kg）的浓度评估了两种物种的处理。fish鱼和猪鱼对每个测试的cGnRH IIa都有反应，从猪中收集到多达100个微克/千克的九个可行产卵，从pin鱼中收集到多达200个微克/千克的五个活泼卵。猪鱼的产卵量，卵和幼体的大小以及孵化成功率和首次喂养的存活率都存在显着差异。pin鱼的总产卵量，繁殖力，卵和幼体的大小以及孵化成功率和首次喂养的存活率均存在显着差异。虽然对这两个物种的产卵诱导都是有效的，但与cGnRH IIa相关的产卵质量可能会有所下降，至少对于猪鱼而言。