FISH 336 Introduction to Aquaculture PDF
Preview FISH 336 Introduction to Aquaculture
Review Cell Cycle Phases, G2 Arrest & Gametogenesis Meiosis, Diploid 2n4c Cell vs. Haploid 1n1c Gamete Hormone Control - Spermatogenesis vs. Oogenesis Fertilization – Blocks to Polyspermy Animal Life Cycle Model Cleavage Stage – Nuclear/Cytoplasmic Ratio Blastula Stage – Hollow Ball of Cells Mid Blastula Transition – Genome Turns On Gastrula – Form 3 Tissue Layers Review Larval Classifications By Food: Lecithotropic vs. Planktotropic By Development: Direct vs. Indirect Ecological: r and K Selected Metamorphosis Change to the Body Plan Radical Rearrangement of Tissues Degree of Transformation Highly Variable Carp Breeding I Existing Strains Removed from Wild Carp Can Breed Throughout the Year Carp Are Seasonal Breeders – Spring Spawn After Dark or Early Morning Segregate Sexes to Prevent Spawning Eggs Laid on Foliage near Water Surface Carp Breeding II Induce Spawn: Transfer to Spawning Ponds Fibrous Materials Substitutes for Foliage Tropical Carp Breed 2 - 4x / yr Temperate Zones –Pituitary Gland Extracts Contains Gonadotrophic Hormones Used to Provoke Natural Spawning or Aid in Stripping Gametes. Move Fertilized Spawn to Hatching Ponds Carp Pituitary Removal Zebrafish Pituitary Hormones From Fish Anterior Pituitary Gonadotropin I (GTH-I) – Sequence Orthologous to FSH – αβ Chains Gonadotropin II (GTH-II) – Sequence Orthologous to LH – αβ Chains Other Hormones Thyroid Stimulating Hormone (TSH) – αβ Chains Growth Hormone (GH) Prolactin (PRL) 3 Pro-opiomelanocortin Hormones (POMC) Adrenocorticotropic Hormone (ACTH Lipotropic Hormone (LPH) β-endorphin Fish Hormonal Control Over Reproduction Gonadotropins GTH-I and GTH-II GTH-I - Follicle Stimulating Hormone (FSH) Causes Ovary to Make LH Receptors GTH-II - Luteinizing Hormone (LH) Stimulates Ovary to Make Progesterone (P4) Directs Ovulation & Corpus Luteum Formation Testis to Make Testosterone (T) Progesterone & Testosterone - Steroid Hormones Testosterone –Maturation of Spermatogonia Progesterone – Maturation of Oogonia Pituitary Gland Hormones Luteinizing Hormone (LH) in Both ♂ & ♀ ♀ LH Stimulates Ovary to make Progesterone Directs Ovulation & Corpus Luteum Formation ♂ LH Stimulates Testis to make Testosterone LH is a GlycoProtein Hormone with α and β Chains Gonad Target Tissue Produces Steroid Hormone Comparative Endocrinology Starfish Fish Releasing Hormone GSS LH GTH-II or Location CNS CNS Type Protein Protein Target Gonads Gonads Releases MIS MIS
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